I'd love an achievement with a title, but no tiers please.

Agreed. One tier, and a title. But it's a good idea, character-wise. Like, just imagine the actual social situation: people getting drunk and grooving all night long; one-on-one dance-offs; and just plain showing off :D

I agree a one and done achievement should be made of it, but anything past that is really a waste of time. No one will want to waste that much time in an already time-crunched event. I'd much rather dance and get trinkets than dance by myself and get nothing more than a forum title and a bunch of tiered achievement levels out of the deal.

I'm not a big fan of the tier idea, but I think if the achievement were created as a one and done type of deal that could be cute. Have a funny title or item rewarded. Just something small that's a little nod toward the holiday/activity.