I've been to that great location and seen his trailer too!
sometimes you can clear enough space to fly, but as soon as you take a break those gaps close-in. I've been chased out of large locations occasionally too. The crowd just swells until it's dangerous (or expensive) for me to keep trying. A group of rev fliers can generally keep their space, but a single or a couple of us have little chance.
You've got to have your stuff down tight to fly throughout the crowds and you need somebody in charge to actually approve of this activity. I've fallen backwards over a stroller and stepped on lots of stuff I should have seen! I've hooked onto earrings, fence posts and moving vehicles. My wife says I'm a bad role model!
"Back in the day when sponsorships were available and common" ... We've been paid performers where we were expected to interact with the crowd, no boundaries, other activities in action. Some of us go big SLKs up on the hills and some of us go short and quading into the mix of folks.
Not much is more fun than knocking the hat off of some unsuspecting bystander when their focus is buried into a i-pad! Dozens of folks are all howling in laughter as the dope looks around trying to figure out what keeps brushing up against him. I love to chase spectators and use converging sidewalks and fences to trap my quarry. The Park rangers at the DC monument grounds see me often enough to enjoy my antics. I need to lure them onto the grass first though, so nobody can complain about my aggressive style.
You need to be able to see the folks CAREFULLY as you interact with them, some like and some don't! Watch their faces and pay attention when they get concerned and wave you off. It's only okay if everyone agrees. Move slowly at kids in strollers. I like to land in the empty ones, since the child isn't using it, my rev can take a break.