As I've mentioned, this could be the next encounter after you clean out the cell block. But probably not.
Unlike the gnolls, the bugbears have been treated well by Lareth. If the PC:s trample in here, there's going to be a fight, no question about it. And it's a nasty fight too. There's a Bugbear Strangler leading a bunch of Bugbear Warriors. The former tends to grab one PC and slowly choke it to death (using it as a shield against any other attackers), while the Warriors move in and hit like freight trains, especially if you have them flank to bring up their hit chance. Going from memory, someone went down every round in this fight.
Having a goblinoid encounter in the module makes sense since Lareth is recruiting from their tribe, but the fight still feels a little redundant after the gnoll fight. As I mentioned back then, it probably doesn't hurt to skip that fight or this one.
Next up: Lareth the Beautiful!