I've done it with a few folks at parties before, mostly with fairly avg to bad results. Guests have their own ideas of how to open dough, and it's hard to get them to stray from your instructions. (Pounding with fists, rolling with rolling pin, throwing it in the air, reballing and then rolling it out without giving enough time to relax, etc.)
Ultimately, guests have fun though. I would say reserve a few doughs for you to demonstrate and cook with, and provide the rest to them to play around with as they see fit. It's fun for them, and there's a sense of pride of creation (particularly for kids, or those adults who don't normally cook). Just be willing to allow for imperfect pizzas in the name of fun.