We do pre-teen dances for two different towns around here. We were asked by local law enforcement a few years ago, about the idea. In one town, the teen drug/pregnancy/ and dropout rate is sky high. (that's where we were approached about doing them) The other town is the "good kids" we don't have any issues there, other than teen drama. So we don't need extra security or anything like that.
We do charge a small entrance fee to help cover building rentals. As the places who will let us use their facilities for free (non-profits) are not big enough for the amount of teens we get coming. The first year took $3,000 out of our pockets, the second about $1,500. This year we haven't been able to afford to do many, so we're trying to get local businesses to sponsor (we even tried to get myspace to sponsor). We've sent out letters (last year) to try to get local people and/or businesses to "sponsor a teen". Write them an encouraging letter once in awhile. Pay for their way into the dances. Etc.. whatever. We, personally can't keep up w/ all the kids that need moral support, encouragement, etc. I hate to lose track of them, or for them to slip out from under us, to where we don't know what's going on w/ them anymore. (that has a tendency to be the time when they're getting into drugs or drinking)
We've been through some trials alot. But being able to mentor to the teens in this area has been such a blessing. Scary at times.. as the cops showed up once flying through the parking lot, pulled up and pulled out guns instantly and told two teens to put their hands up.. and our 5 yo (he was 5 at the time) son w/ high functioning autism was standing about 5 ft from the teens. They wouldn't let my husband get to him. and trying to talk to them (officers) in a non threatening way, to let them understand our 5yo has autism and is not going to listen to them... it was pretty chaotic and scary! One of the teens was also autistic (high functioning just like our son). The officers were after the other teen, who we'd never seen before then. That was not a fun situation!!!
Sad at times too, the teens have come to trust us, and look up to us as their mentors. They call us at home at all hours of the day/night. They come to us when they're in trouble (pregnant, in jail, job/school advice, etc) I've lost many nights of sleep praying for these kids. I wish we could do more!
There are kids who show up early to help us set up.. just b/c they want to. (to be away from home, or just to chat) There are kids whose teachers and/or family have just given up on them.. and they just want some attention.. and some positive words, and someone to think that they're not "bad". Our own children have probably been subjected to more than they've needed to be, but I hope that it grows their character.
We also advocate for preschool children in our state. My DH is also on a Fatherhood Coalition board. (statewide)