Hey Robert,
Thanks for reaching out to us!
We don’t have any functionality built directly into the plugin to automatically feed the events into the main site within a multisite network, however it looks like there have been some users that have created some functionality on top of our plugin for something like this.
Take a look at https://theeventscalendar.com/cross-site-events-widget-for-multisite-users-from-shenandoah-university/?utm_medium=twitter&utm_campaign=support and see if it would help in what you’re looking for here.
Thanks!