Hey Tim!
Two things…
Check out the Resource Wiki: Zwift Resource Wiki (new) 🗺
…and in that, you’ll find a link to this: ZwiftHacks Events database - THE tool for finding events, with sort and search functions. Links on each event will redirect to their respective Zwift.com page where you can register.
If your team isn’t publishing events in a way that they show up there, you’ll have to connect to your teammates directly. Are they using the “Clubs” functionality within Zwift, or perhaps some other tool like Discord?