This makes 2 weddings he's thrown together for his friends...or at least it will come S4. For all his snarkiness, his actions prove he does care about M/L and B/M.
He's gathered everyone up in the loft, and he starts doling out instructions to everyone. Their little jabs to each other make me laugh.
The only one that doesn't have a specific job is Brian, but I guess when you're the manager, you get to supervise (and also find some place to make engraved rings in like a day).
The mask he pulls on reminds me of the Rage mask... do you think there's any significance there? The mask is used both as a distancing mechanism (like in 220) and as a symbol of the superhero. In this particular ep, I think it's symbolic of his "hero" status, with him coming to the rescue and doing the right thing.
Michael, of course, sees right through his "I don't want to hear the word wedding again" bs. ;)