See, you did survive. LOL Aren't they fun. I used to love it when the kids had parties like that. A huge tent outside, sleeping bags and pillows, lots of pop in a cooler, a TON of food from the store, a stereo, forwarned neighbors with lots of patience (their kids were over here too) and a good sense of humor. That is the recipe for surviving 15-30 teenagers.
Now it is grandkids once in awhile. Enjoy it while you can... they are gone before you know it..