I think common sense applies...if you're in a group, less risk; if you're out in the woods by yourself, more risk. If you do night-time stuff, more risk; day-time stuff, less risk. If it's a designated astronomy event, less risk; if you're setting up on a downtown street in the middle of a festival, more risk.
We have a group locally who does "sidewalk" astronomy outside of a local mall with permission from the bookstore, with 5-6 people setting up scopes. No one has ever had significant problems...the biggest risk is people who want to tell you about their astrology beliefs or that the moon landing was faked or about what political party you are registered with or if you have found God yet.
At a local dark site, we have some informal rules including that you never leave anyone observing alone unless they prefer to stay by themselves aka don't just up and leave without telling them you're heading out, so if they feel unsafe alone, they can pack up too.
At monthly public star parties, we averaged 150-300 people, greatest "risk" was people tripping over things in the dark, and it almost never happened. Those glow-in-the-dark bracelets can be bought in red, and put around the feet of tripods to let people know where or where not to step, if you have a wide setup.
Within the formal clubs, the sad commentary is we have to worry about risk the opposite direction which is are our volunteers who may be working with kids in schools or at the observation site screened for security first? Do they know that if they have a scope that is 4' high and a kid that is 3' high, they don't just reach over and pick up the kid and hold them up without asking permission first. Some things you think would be obvious to avoid are not obvious to some extreme introverts, and the hobby does tend to attract a lot of introverts. Not all of them have great social skills.
They can be awkward. And if they're awkward with kids, sometimes the parents get annoyed. And tbh, we have had to tell a couple of volunteers to also knock off the politics or religion talk when people come to look at the stars. "It's a tripod, not a soapbox!". 
Paul