We hosted the after prom for our D's last year. It coincided with his 16th.
We hired a massive marquee with dance floor, a proper DJ, straw bales for seating , porta loos so no-one had to come in the house.
We had elder D's (22) and 2 of his mates in high vis coats wandering around. They used their cars to block the drive so no-one could come in unseen.
We charged the kids a tenner each and ticked off names as they paid before the event. It was smart dress. You could pay on the door if your name was on the list. ( The whole of year 11). We funded the other £500.
We allowed them to bring tents earlier in the day if they wanted to stay over. No sleeping in the marquee.
We had around 120/30 youngsters here and they all got very drunk. At 3am I made bacon rolls for everyone and took them out. The kids were very grateful.
We did have some kids trying to get into the house, but D's and his mates sorted them out quickly. We ordered taxis for those unable to remember their own names and made sure they got home safely.
We had some gatecrashers from another school that got past our security by paying on the door and knowing the right names. About 5 lads. Just before they left at 4.30am they trashed a load of plants outside of our summer house, tipped up tables in the marquee and smashed up some decking, threw some chairs into the field next to us. By the time we realised they'd run off. Of course no-one knew who they were 🤔 sure they didn't.
We didn't provide any alcohol except 4 Smirnoff ice for our D's. We provided loads of soft drinks and crisps etc.
As I cleaned up the next day I was shocked by the amount of spirit bottles and the amount of gas canisters. 😟
The other thing was although I provided my phone number to every child, only about 3 parents rang or contacted me to see where their teen DC was going at 11pm until 4 am the following day. Most kids turned up in cabs straight from the prom.
Hope that helps.