Our daughter just had an 8th grade graduation party for her daughter, and 40-50 people were there. She had about 20 lbs of pork and 50 pieces of fried chicken, plus potato salad and other dishes.
Are you talking raw pork that you will cook yourself or already BBQ'd pork?
With raw pork, you can count on about 40% shrinkage, so Liz is pretty close at 75 lbs.
Kim figures on 1/3 to half a lb of cooked pork per person. If you have any left over, it freezes great in ziplock bags.
If I were you, I would also have 6-8 pkgs of hot dogs and buns on hand, too.
We get by with a little help from our friends