Fai is definitely in on the gift exchange! And he could potentially do anything else so long as he gets prodded into it. Kyouya...will do whatever the heck Tamaki tells him to do. :|
As for dancing...I know that Ribbons was the primary dance teacher, but everyone in the Host Club does know how to ballroom dance, so if there are people out there who need lessons, Host Club members are probably willing to give lessons (though that might just be handwaved, depending?).
Can't think of anything else but if I do, I'll let you know!