If you're having the event on public property, like a park, I wouldn't bother with waivers. Waivers signed by minors or their parents are rarely enforced in criminal cases. If a bunch of people show up in a park with their own blasters, and someone gets shot in the eye, you're just the guy who told everyone the time and the date to show up. But if you hand out waivers you're automatically the person in charge, and on some level you're taking responsibility for what goes on.
The problem is I kind of am the person in charge but we are playing on public property(I or my friends might loan out ammo and occasionaly blasters)
Probably but honestly just realize that Stefans will hurt a bit and deal with it. Up here in Canada we use glue domes almost exclusively, be lucky you aren't up here.
I don't want to use stock darts but I am not an older nerfer(I'm not even a teenager yet) and neither are my friends so I don't want them getting really mad at me but I still want to be overpowered as hell