You ever go to BBQ restaurants? Here in our area, most are not good, they all suffer from the same problem. They smoke their meat, and have to wait for customers to buy it, but they don't have enough customers to turn over the meat every 2 or 3 hours. So the meat sits in warmers and drys out and loses all the flavor.
You own a smoker, just a guess, but it does hold 4 Butts the size you want right? I have been in your spot with 2 graduations and each time I did the pulled pork bbq sandwiches, did the smoking during the night, plus smoked chickens, got about 3 or 4 hours sleep. Went to graduation then big BBQ lunch for family and friends. I wrapped the butts n birds in foil 2 or 3 wraps, then 2 or 3 wraps of plastic wrap, stored in ice chests, towel pre-warmed in dryer, layer of tin foil, wrapped butts n chickens, alum foil over top, then another pre-warmed towel, lid taped shut. The meat was still hot when pulled about 7 hours after cooking.
It just seems that fresh Q is better than frozen thawed and re-heated Q, no exceptions. If you need 4 Butts then the party is going to be big, so all the prep can be done while cooking the butts except for those items that need to be done right before serving. As for having enough energy after smokin most the night, the excitement will keep you going, plus when you blow em away with your amazing fresh smoked pulled pork you will know it was worth it.
Just a plug for fresh, your schedule may be way to busy to do fresh.
Good luck with your grad party!