I would calculate 1/3lb for all attendees which will give you plenty as kids won’t eat as much and if serving sandwiches the bread will be filling as well as sides. Also, if you’re doing hot dogs or something for kids you could go lower in my opinion. I always fear I won’t have enough and 1/3lb. never gave me issues when sides and dessert are involved. That said, if it is adults only bump up to 1/2lb per.
Your pulled pork substance will “shrink”down about 50% after trimming and cooking. Factor that in and that’s my thought for success.
150 people, 1/3lb. person would be 50lbs add in 50% shrinkage from package to end of cook (20lbs) so buy 75lbs (8 butts @ ~10lbs). My humble opinion.
Compared to your previous cook my estimation seems low. How much leftover did you have when cooking for 60? How big were the butts???
Good luck!!!!!
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