I have the same issue. According to their own FAQ it should all still work: https://theeventscalendar.com/knowledgebase/expired-licenses/
If my plugin license expires, will my calendar stop working?
Our plugins will continue to work even if the license has expired. You will not lose any data or events. However, you will not be able to download new updates, which means you won’t get new features or bug fixes. You also won’t be able to post in our premium support forums to get help.
If you decide not to renew a license and are still using the plugin, you’ll want to avoid updating our core plugin (The Events Calendar) so that the versions stay compatible. Running mismatched plugins can cause problems with functionality.