I would guess (100% guess) there won't be any more of those big on site events. I could see them doing stuff like Jeep just did at Moab - basically bring your truck and let's hang out type stuff, but not pre-sale stuff.
Looks like most of the new drive events are home drives.
I would think they may do some meet and great events as the service centers are opening. As long as it is not an issue like in Texas where they need a dealer license to do that.
Rivian is in a tough spot when considering how much future business to generate. But they do need to allow pre-order holders a test drive before final acceptance.