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
@@ -4,3 +4,5 @@
 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/redux-setup.js b/web/redux/redux-setup.js
--- a/web/redux/redux-setup.js
+++ b/web/redux/redux-setup.js
@@ -44,6 +44,7 @@
 import { type NavInfo } from '../types/nav-types.js';
 
 export type WindowDimensions = { width: number, height: number };
+
 export type AppState = {
   navInfo: NavInfo,
   deviceID: ?string,
@@ -57,6 +58,7 @@
   updatesCurrentAsOf: number,
   loadingStatuses: { [key: string]: { [idx: number]: LoadingStatus } },
   calendarFilters: $ReadOnlyArray<CalendarFilter>,
+  communityIDFilter: ?string,
   urlPrefix: string,
   windowDimensions: WindowDimensions,
   cookie?: void,