Hi Larry,
Thanks so much for reaching out and for your interest in our products!
With Community Events, users can add events right from the front-end of the site, which will then appear on the main calendar on your site.
You can choose whether to review these events first, or to have them published right away.
In order to add the events to multiple sites, you can use our Event Aggregator to import events into those sites.
You can also check out our plugins in action on our demo site.
Let me know if you have any other questions!
Thanks,
Jaime