Add option to specify a timezone for events (#2623)

* Add option to specify a timezone for events

* Amend message, update docs

src/widgets/calendar/event.jsx

@@ -39,3 +39,7 @@ export default function Event({ event, colorVariants, showDate = false, showTime
     </div>
   );
 }
+
+export function compareDateTimezoneAware(date, event) {
+  return date.setZone(event.date.zoneName).startOf("day").valueOf() === event.date.startOf("day").valueOf();
+}