diff --git a/lib/actions/community-actions.js b/lib/actions/community-actions.js
new file mode 100644
--- /dev/null
+++ b/lib/actions/community-actions.js
@@ -0,0 +1,4 @@
+// @flow
+
+export const updateCalendarCommunityFilter = 'UPDATE_CALENDAR_COMMUNITY_FILTER';
+export const clearCalendarCommunityFilter = 'CLEAR_CALENDAR_COMMUNITY_FILTER';
diff --git a/lib/reducers/calendar-filters-reducer.js b/lib/reducers/calendar-filters-reducer.js
--- a/lib/reducers/calendar-filters-reducer.js
+++ b/lib/reducers/calendar-filters-reducer.js
@@ -1,5 +1,9 @@
 // @flow
 
+import {
+  updateCalendarCommunityFilter,
+  clearCalendarCommunityFilter,
+} from '../actions/community-actions.js';
 import { siweAuthActionTypes } from '../actions/siwe-actions.js';
 import {
   newThreadActionTypes,
@@ -32,17 +36,19 @@
   fullStateSyncActionType,
   incrementalStateSyncActionType,
 } from '../types/socket-types.js';
-import type { RawThreadInfo } from '../types/thread-types.js';
+import type { RawThreadInfo, ThreadStore } from '../types/thread-types.js';
 import { updateTypes } from '../types/update-types-enum.js';
 import {
   type ClientUpdateInfo,
   processUpdatesActionType,
 } from '../types/update-types.js';
 import { setNewSessionActionType } from '../utils/action-utils.js';
+import { filterThreadIDsBelongingToCommunity } from '../utils/drawer-utils.react.js';
 
 export default function reduceCalendarFilters(
   state: $ReadOnlyArray<CalendarFilter>,
   action: BaseAction,
+  threadStore: ThreadStore,
 ): $ReadOnlyArray<CalendarFilter> {
   if (
     action.type === logOutActionTypes.success ||
@@ -101,6 +107,25 @@
       state,
       action.payload.threadInfos,
     );
+  } else if (action.type === updateCalendarCommunityFilter) {
+    const nonThreadFilters = nonThreadCalendarFilters(state);
+
+    const threadIDs = Array.from(
+      filterThreadIDsBelongingToCommunity(
+        action.payload,
+        threadStore.threadInfos,
+      ),
+    );
+    return [
+      ...nonThreadFilters,
+      {
+        type: calendarThreadFilterTypes.THREAD_LIST,
+        threadIDs,
+      },
+    ];
+  } else if (action.type === clearCalendarCommunityFilter) {
+    const nonThreadFilters = nonThreadCalendarFilters(state);
+    return nonThreadFilters;
   }
   return state;
 }
diff --git a/lib/reducers/master-reducer.js b/lib/reducers/master-reducer.js
--- a/lib/reducers/master-reducer.js
+++ b/lib/reducers/master-reducer.js
@@ -98,7 +98,11 @@
       messageStore,
       updatesCurrentAsOf,
       urlPrefix: reduceURLPrefix(state.urlPrefix, action),
-      calendarFilters: reduceCalendarFilters(state.calendarFilters, action),
+      calendarFilters: reduceCalendarFilters(
+        state.calendarFilters,
+        action,
+        threadStore,
+      ),
       notifPermissionAlertInfo: reduceNotifPermissionAlertInfo(
         state.notifPermissionAlertInfo,
         action,
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -1046,6 +1046,14 @@
       +error: true,
       +payload: Error,
       +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'UPDATE_CALENDAR_COMMUNITY_FILTER',
+      +payload: string,
+    }
+  | {
+      +type: 'CLEAR_CALENDAR_COMMUNITY_FILTER',
+      +payload: void,
     };
 
 export type ActionPayload = ?(Object | Array<*> | $ReadOnlyArray<*> | string);
diff --git a/lib/utils/drawer-utils.react.js b/lib/utils/drawer-utils.react.js
--- a/lib/utils/drawer-utils.react.js
+++ b/lib/utils/drawer-utils.react.js
@@ -1,10 +1,12 @@
 // @flow
 
-import { threadIsChannel } from '../shared/thread-utils.js';
+import { values } from './objects.js';
+import { threadInFilterList, threadIsChannel } from '../shared/thread-utils.js';
 import { communitySubthreads } from '../types/thread-types-enum.js';
-import {
-  type ThreadInfo,
-  type ResolvedThreadInfo,
+import type {
+  RawThreadInfo,
+  ThreadInfo,
+  ResolvedThreadInfo,
 } from '../types/thread-types.js';
 
 export type CommunityDrawerItemData<T> = {
@@ -81,4 +83,23 @@
   return result;
 }
 
-export { createRecursiveDrawerItemsData, appendSuffix };
+function filterThreadIDsBelongingToCommunity(
+  communityID: string,
+  threadInfosObj: { +[id: string]: ThreadInfo | RawThreadInfo },
+): $ReadOnlySet<string> {
+  const threadInfos = values(threadInfosObj);
+  const threadIDs = threadInfos
+    .filter(
+      thread =>
+        (thread.community === communityID || thread.id === communityID) &&
+        threadInFilterList(thread),
+    )
+    .map(item => item.id);
+  return new Set(threadIDs);
+}
+
+export {
+  createRecursiveDrawerItemsData,
+  appendSuffix,
+  filterThreadIDsBelongingToCommunity,
+};
diff --git a/web/redux/action-types.js b/web/redux/action-types.js
--- a/web/redux/action-types.js
+++ b/web/redux/action-types.js
@@ -4,5 +4,3 @@
 export const updateWindowDimensionsActionType = 'UPDATE_WINDOW_DIMENSIONS';
 export const updateWindowActiveActionType = 'UPDATE_WINDOW_ACTIVE';
 export const setDeviceIDActionType = 'SET_DEVICE_ID';
-export const updateCalendarCommunityFilter = 'UPDATE_CALENDAR_COMMUNITY_FILTER';
-export const clearCalendarCommunityFilter = 'CLEAR_CALENDAR_COMMUNITY_FILTER';
diff --git a/web/redux/community-picker-reducer.js b/web/redux/community-picker-reducer.js
new file mode 100644
--- /dev/null
+++ b/web/redux/community-picker-reducer.js
@@ -0,0 +1,28 @@
+// @flow
+
+import {
+  updateCalendarCommunityFilter,
+  clearCalendarCommunityFilter,
+} from 'lib/actions/community-actions.js';
+import type { ThreadStore } from 'lib/types/thread-types.js';
+
+import type { Action, CommunityPickerStore } from './redux-setup';
+
+export function reduceCommunityPickerStore(
+  communityPickerStore: CommunityPickerStore,
+  threadStore: ThreadStore,
+  action: Action,
+): CommunityPickerStore {
+  if (action.type === updateCalendarCommunityFilter) {
+    return {
+      ...communityPickerStore,
+      calendar: action.payload,
+    };
+  } else if (action.type === clearCalendarCommunityFilter) {
+    return {
+      ...communityPickerStore,
+      calendar: null,
+    };
+  }
+  return communityPickerStore;
+}
diff --git a/web/redux/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -8,7 +8,6 @@
   deleteAccountActionTypes,
 } from 'lib/actions/user-actions.js';
 import baseReducer from 'lib/reducers/master-reducer.js';
-import { nonThreadCalendarFilters } from 'lib/selectors/calendar-filter-selectors.js';
 import { mostRecentlyReadThreadSelector } from 'lib/selectors/thread-selectors.js';
 import { isLoggedIn } from 'lib/selectors/user-selectors.js';
 import { invalidSessionDowngrade } from 'lib/shared/session-utils.js';
@@ -21,10 +20,7 @@
 import type { DraftStore } from 'lib/types/draft-types.js';
 import type { EnabledApps } from 'lib/types/enabled-apps.js';
 import type { EntryStore } from 'lib/types/entry-types.js';
-import {
-  type CalendarFilter,
-  calendarThreadFilterTypes,
-} from 'lib/types/filter-types.js';
+import { type CalendarFilter } from 'lib/types/filter-types.js';
 import type { LifecycleState } from 'lib/types/lifecycle-state-types.js';
 import type { LoadingStatus } from 'lib/types/loading-types.js';
 import type { MessageStore } from 'lib/types/message-types.js';
@@ -42,9 +38,8 @@
   setDeviceIDActionType,
   updateNavInfoActionType,
   updateWindowDimensionsActionType,
-  updateCalendarCommunityFilter,
-  clearCalendarCommunityFilter,
 } from './action-types.js';
+import { reduceCommunityPickerStore } from './community-picker-reducer.js';
 import {
   reduceCryptoStore,
   setPrimaryIdentityKeys,
@@ -56,7 +51,6 @@
 import reduceNavInfo from './nav-reducer.js';
 import { getVisibility } from './visibility.js';
 import { databaseModule } from '../database/database-module-provider.js';
-import { filterThreadIDsBelongingToCommunity } from '../selectors/calendar-selectors.js';
 import { activeThreadSelector } from '../selectors/nav-selectors.js';
 import { type NavInfo } from '../types/nav-types.js';
 import { workerRequestMessageTypes } from '../types/worker-types.js';
@@ -121,15 +115,7 @@
   | { +type: 'SET_PRIMARY_IDENTITY_KEYS', payload: ?OLMIdentityKeys }
   | { +type: 'SET_NOTIFICATION_IDENTITY_KEYS', payload: ?OLMIdentityKeys }
   | { +type: 'SET_PICKLED_PRIMARY_ACCOUNT', payload: ?PickledOLMAccount }
-  | { +type: 'SET_PICKLED_NOTIFICATION_ACCOUNT', payload: ?PickledOLMAccount }
-  | {
-      +type: 'UPDATE_CALENDAR_COMMUNITY_FILTER',
-      +payload: string,
-    }
-  | {
-      +type: 'CLEAR_CALENDAR_COMMUNITY_FILTER',
-      +payload: void,
-    };
+  | { +type: 'SET_PICKLED_NOTIFICATION_ACCOUNT', payload: ?PickledOLMAccount };
 
 export function reducer(oldState: AppState | void, action: Action): AppState {
   invariant(oldState, 'should be set');
@@ -145,39 +131,6 @@
       ...state,
       windowActive: action.payload,
     });
-  } else if (action.type === updateCalendarCommunityFilter) {
-    const nonThreadFilters = nonThreadCalendarFilters(state.calendarFilters);
-
-    const threadIDs = Array.from(
-      filterThreadIDsBelongingToCommunity(
-        action.payload,
-        state.threadStore.threadInfos,
-      ),
-    );
-    return {
-      ...state,
-      calendarFilters: [
-        ...nonThreadFilters,
-        {
-          type: calendarThreadFilterTypes.THREAD_LIST,
-          threadIDs,
-        },
-      ],
-      communityPickerStore: {
-        ...state.communityPickerStore,
-        calendar: action.payload,
-      },
-    };
-  } else if (action.type === clearCalendarCommunityFilter) {
-    const nonThreadFilters = nonThreadCalendarFilters(state.calendarFilters);
-    return {
-      ...state,
-      calendarFilters: nonThreadFilters,
-      communityPickerStore: {
-        ...state.communityPickerStore,
-        calendar: null,
-      },
-    };
   } else if (action.type === setNewSessionActionType) {
     if (
       invalidSessionDowngrade(
@@ -237,6 +190,12 @@
     }
   }
 
+  const communityPickerStore = reduceCommunityPickerStore(
+    state.communityPickerStore,
+    state.threadStore,
+    action,
+  );
+
   state = {
     ...state,
     navInfo: reduceNavInfo(
@@ -246,6 +205,7 @@
     ),
     deviceID: reduceDeviceID(state.deviceID, action),
     cryptoStore: reduceCryptoStore(state.cryptoStore, action),
+    communityPickerStore,
   };
 
   return validateState(oldState, state);
diff --git a/web/selectors/calendar-selectors.js b/web/selectors/calendar-selectors.js
--- a/web/selectors/calendar-selectors.js
+++ b/web/selectors/calendar-selectors.js
@@ -8,10 +8,9 @@
 } from 'lib/selectors/calendar-selectors.js';
 import { threadInfoSelector } from 'lib/selectors/thread-selectors.js';
 import type SearchIndex from 'lib/shared/search-index.js';
-import { threadInFilterList } from 'lib/shared/thread-utils.js';
 import type { FilterThreadInfo } from 'lib/types/filter-types.js';
-import type { ThreadInfo, RawThreadInfo } from 'lib/types/thread-types.js';
-import { values } from 'lib/utils/objects.js';
+import type { ThreadInfo } from 'lib/types/thread-types.js';
+import { filterThreadIDsBelongingToCommunity } from 'lib/utils/drawer-utils.react.js';
 
 import type { AppState } from '../redux/redux-setup.js';
 import { useSelector } from '../redux/redux-utils.js';
@@ -26,21 +25,6 @@
   return baseUseFilterThreadSearchIndex(calendarActive);
 }
 
-function filterThreadIDsBelongingToCommunity(
-  communityID: string,
-  threadInfosObj: { +[id: string]: ThreadInfo | RawThreadInfo },
-): $ReadOnlySet<string> {
-  const threadInfos = values(threadInfosObj);
-  const threadIDs = threadInfos
-    .filter(
-      thread =>
-        (thread.community === communityID || thread.id === communityID) &&
-        threadInFilterList(thread),
-    )
-    .map(item => item.id);
-  return new Set(threadIDs);
-}
-
 const filterThreadIDsBelongingToCommunitySelector: (
   state: AppState,
 ) => ?$ReadOnlySet<string> = createSelector(
diff --git a/web/sidebar/community-drawer-item-handlers.react.js b/web/sidebar/community-drawer-item-handlers.react.js
--- a/web/sidebar/community-drawer-item-handlers.react.js
+++ b/web/sidebar/community-drawer-item-handlers.react.js
@@ -3,10 +3,10 @@
 import * as React from 'react';
 import { useDispatch } from 'react-redux';
 
+import { updateCalendarCommunityFilter } from 'lib/actions/community-actions.js';
 import type { ThreadInfo } from 'lib/types/thread-types.js';
 
 import type { CommunityDrawerItemHandler } from './community-drawer-item-handler.react.js';
-import { updateCalendarCommunityFilter } from '../redux/action-types.js';
 import { useCommunityIsPickedCalendar } from '../selectors/calendar-selectors.js';
 import {
   useOnClickThread,
diff --git a/web/sidebar/community-picker.react.js b/web/sidebar/community-picker.react.js
--- a/web/sidebar/community-picker.react.js
+++ b/web/sidebar/community-picker.react.js
@@ -4,16 +4,14 @@
 import * as React from 'react';
 import { useDispatch } from 'react-redux';
 
+import { clearCalendarCommunityFilter } from 'lib/actions/community-actions.js';
 import { useModalContext } from 'lib/components/modal-provider.react.js';
 import SWMansionIcon from 'lib/components/SWMansionIcon.react.js';
 
 import CommunityCreationModal from './community-creation/community-creation-modal.react.js';
 import CommunityDrawer from './community-drawer.react.js';
 import css from './community-picker.css';
-import {
-  clearCalendarCommunityFilter,
-  updateNavInfoActionType,
-} from '../redux/action-types.js';
+import { updateNavInfoActionType } from '../redux/action-types.js';
 import { useSelector } from '../redux/redux-utils.js';
 
 function CommunityPicker(): React.Node {