Calendar isFollowing button

src/api/group.js

@@ -727,6 +727,21 @@ const groupReq = {
         return request(`calendar/featured?date=${date}`, {
             method: 'GET'
         });
+    },
+
+    followGroupEvent(params) {
+        return request(`calendar/${params.groupId}/${params.eventId}/follow`, {
+            method: 'POST',
+            params: {
+                isFollowing: params.isFollowing
+            }
+        }).then((json) => {
+            const args = {
+                json,
+                params
+            };
+            return args;
+        });
     }
 
     // getRequestedGroups() {