diff --git a/src/common.ts b/src/common.ts
index f803e8c..cd907a8 100644
--- a/src/common.ts
+++ b/src/common.ts
@@ -133,11 +133,5 @@ export function main(
 
   calendar.render();
 
-  function refresh() {
-    calendar.refetchEvents();
-    calendar.today();
-  }
-
-  // refresh data every five minutes
-  window.setInterval(refresh, 5 * 60 * 1000);
+  return calendar;
 }
diff --git a/src/wall-display.ts b/src/wall-display.ts
index 2aea3fc..c8dd9dc 100644
--- a/src/wall-display.ts
+++ b/src/wall-display.ts
@@ -31,4 +31,12 @@ const calendarOptions: CalendarOptions = {
     : [],
 };
 
-main(calendarOptions, !toolFilter);
+const calendar = main(calendarOptions, !toolFilter);
+
+function refresh() {
+  calendar.refetchEvents();
+  calendar.today();
+}
+
+// refresh data every five minutes
+window.setInterval(refresh, 5 * 60 * 1000);