I'm also going to post this in DIY, since we're mostly DIYing our food!
Websites online suggested 30lbs of meat per 100 people, and DF got a quote from a local BBQ place (very popular) that would provide the food (but not actually cater) and they suggested 20lbs for 80 people (we'd have about 70-75 ppl). Does this sound right to you? And would that be 20lbs PER meat (say, turkey and beef) or 20lbs total (so 10lb each?)