I never cook a butt for the day its due. I always do it a day or even a week ahead. Why? Its like beans or gumbo or chili, always better the day after. BUT that being said I do now like finishing sauce. This is JJ's, plus my little add at the bottom. You don't want to float the pulled pork in a gallon of it. For a big butt, I will normally probably only use a couple a tablespoons Max! You don't want to taste the finishing sauce, you don't even want folks to realize you used any. Its about a little bit of moisture with a slight flavor modifier. I keep a squirt bottle of it made up in the reefer at all time. One recipe will easily handle 10 butts. You want your guest to wonder why yours tastes better than others, but not be able to tell you used a finishing sauce.
After I pull a butt, I add just a little to the meat and throw it in the reefer. The next day, I dump it in a crockpot, taste it for seasonings and moisture and adjust just before serving. If the flavors are good but its dry you can always use just apple juice ( I, to my knowledge have never done a dry butt). To serve it, I set the crock pot on the table. I heat up some your favorite BBQ sauce, and place in a bowl with a spoon next to the crock pot. The other side of the pot put the tray with small buns. It keeps folks from getting more than they want and wasting it. A bowl of slaw is all that is left.
JJ's Finishing Sauce
1C Apple Cider Vinegar
2T Worcestershire Sauce or more to taste
1/4C Brown Sugar
1T Smoked Paprika
2 tsp Granulated Garlic
2 tsp Granulated Onion
2 tsp Fine Grind Black Pepper
1 tsp Celery Salt
1 tsp Cayenne Pepper or Chipotle powder. Add more if you like Heat.
1/2 tsp Grnd Allspice
Extras per Me:
¼ C Honey
1 C Apple cider
Whatever you do, good luck but you will not need it. Low and slow and you'll impress them without any worries. The best advise I ever got at this site was when I first arrived from oldschoolbbq. He said,"patience", thats all you need.