Rejoin dungeon?

[Bixby]

So you can rejoin a DF group, but not a premade. That's just crazy!

No, HEC meant the rest of the party can get a replacement in a DF group, since you're kicked all the way out of the party and not just the instance.

There's no way to rejoin any instance, other than getting lucky (leave the party entirely if applicable, queue in progress for the dungeon in question, cross your fingers).