Last time I smoked a pork butt the day before a holdiay I pulled it about 20 minutes after it came off the smoker, put it in a throw away aluminum serving pan (big one) and covered it with foil. When it needed to be heated I put some water in the bottom of the pan for steam and put it in a 300 degree oven until it was warm then turned oven down to the warm setting. no one knew the difference. Don't know what the experts do though.