Hajime would attend and offer his giant bug self as a volunteer to do giant bug things on the mission.

Arthur would also attend and volunteer, and he should probably be set about doing some completely different task on the other side of town for a really good distraction. But hey, the guy can never resist a Network social event.

And just for the heck of it, Tater the Parrot would also attend but not volunteer, for he is only a parrot who just wanted to get out of Thomas's apartment for a little while, maybe parrot at meet a few people.