it is pretty much too late.
A) you need to find a girl who does not have a date, which is quite hard before the prom
B) if you do find a girl, you need to make sure your tux matches her date, generally the tux is prepared about a week before prom, it will extremely hard to get it done a few days before
C) you need to make arrange for dinner and a limo. Dinner, not so bad, finding a limo have fun. By now all the limo drivers are booked and it might be difficult to tag along with an another group they might already be full.
you came to us like 2 weeks ago and you asked for help. you did nothing when we offered advice. sorry buddy, you are SOL.