hay what about materials? BBQ means food right? Or else it would just be called Bonfire

Gotta think this through, for people who is interested try to bring some money. See how many people arrives and then go buy materials needed to do this BBQ, because you know someone is going to back out in last minute and will be short money if done ahead.
I would suggest just do hotdogs, burgers for BBQ stuff and get some chips. Someone bring a big cooler with lots of ice to freeze drinks or anything need to be kept cool.