How to join an event

I’ve had selected an event to join in Zwict companion. But how do I join the event in Zwift? It didn’t offer any event.

Go into any route (can be same route as the event but doesn’t have to be) and ride around or do whatever—at some point before the event, although I can’t recall exactly how long (as much as 15 min? 30min?) you’ll be given an on screen prompt to join the event, and from then on you also see a tab bottom left of the screen to “join event.” When you click to join the event, you are transported from wherever you are to the event warmup area.