diff --git a/keyserver/src/responders/entry-responders.js b/keyserver/src/responders/entry-responders.js
--- a/keyserver/src/responders/entry-responders.js
+++ b/keyserver/src/responders/entry-responders.js
@@ -71,6 +71,10 @@
         type: tString(calendarThreadFilterTypes.THREAD_LIST),
         threadIDs: t.list(t.String),
       }),
+      tShape({
+        type: tString(calendarThreadFilterTypes.COMMUNITY),
+        threadIDs: t.list(t.String),
+      }),
     ]),
   ),
 });
diff --git a/lib/types/filter-types.js b/lib/types/filter-types.js
--- a/lib/types/filter-types.js
+++ b/lib/types/filter-types.js
@@ -5,16 +5,24 @@
 export const calendarThreadFilterTypes = Object.freeze({
   THREAD_LIST: 'threads',
   NOT_DELETED: 'not_deleted',
+  COMMUNITY: 'community',
 });
 export type CalendarThreadFilterType = $Values<
   typeof calendarThreadFilterTypes,
 >;
 
+export type CalendarCommunityFilter = {
+  +type: 'community',
+  +threadIDs: $ReadOnlyArray<string>,
+};
 export type CalendarThreadFilter = {
   +type: 'threads',
   +threadIDs: $ReadOnlyArray<string>,
 };
-export type CalendarFilter = { +type: 'not_deleted' } | CalendarThreadFilter;
+export type CalendarFilter =
+  | { +type: 'not_deleted' }
+  | CalendarThreadFilter
+  | CalendarCommunityFilter;
 
 export const defaultCalendarFilters: $ReadOnlyArray<CalendarFilter> = [
   { type: calendarThreadFilterTypes.NOT_DELETED },
@@ -23,6 +31,8 @@
 export const updateCalendarThreadFilter = 'UPDATE_CALENDAR_THREAD_FILTER';
 export const clearCalendarThreadFilter = 'CLEAR_CALENDAR_THREAD_FILTER';
 export const setCalendarDeletedFilter = 'SET_CALENDAR_DELETED_FILTER';
+export const updateCalendarCommunityFilter = 'UPDATE_CALENDAR_COMMUNITY_FILTER';
+export const clearCalendarCommunityFilter = 'CLEAR_CALENDAR_COMMUNITY_FILTER';
 
 export type SetCalendarDeletedFilterPayload = {
   +includeDeleted: boolean,
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
@@ -30,6 +30,7 @@
   CalendarFilter,
   CalendarThreadFilter,
   SetCalendarDeletedFilterPayload,
+  CalendarCommunityFilter,
 } from './filter-types';
 import type { LifecycleState } from './lifecycle-state-types';
 import type { LoadingStatus, LoadingInfo } from './loading-types';
@@ -678,6 +679,14 @@
       +type: 'SET_CALENDAR_DELETED_FILTER',
       +payload: SetCalendarDeletedFilterPayload,
     }
+  | {
+      +type: 'UPDATE_CALENDAR_COMMUNITY_FILTER',
+      +payload: CalendarCommunityFilter,
+    }
+  | {
+      +type: 'CLEAR_CALENDAR_COMMUNITY_FILTER',
+      +payload: void,
+    }
   | {
       +type: 'UPDATE_SUBSCRIPTION_STARTED',
       +payload?: void,