Currently, while integrating Jira events with Confluence Team Calendars, you have the need to hit a REFRESH button in one the following ways (screenshots attached) in order to have real time information on the Team calendars events synched from Jira.

Ideally, this synchronization should happen automatically in the background at some pre-defined frequency time, and even better if this time frequency could be customized by the site-admin itself via some Configuration setting.

That means, it should get refreshed automatically upon refreshing the browser tab itself, without the need of manually hitting the Confluence Team Calendars REFRESH buttons available in both, the Confluence space Team calendar view, as well as on the My Calendars Confluence view.