For now, the stunt area would be an obvious place to have group character appearances ala Shanghai. It's far enough from the crowds that the characters can show up without face masks (other than their usual ones ala Spider-Man) a couple of times a day and wave. And then run the stuntronic before or after. I'd take that for starters to keep the characters around.
And actually, along with Spider-Man, there are several new character meets announced that are already masked - Ant-Man and Wasp along with Iron Man. Oh, and maybe Groot and Black Panther could still potentially meet too. Or at least show up on the ground rather than up in the stunt area.
Hanging on to any character hope I've got right now!