In the upd8 where vriska and meenah are hanging out together are they in the dark carnival? and does that mean there is a chance the GHB and other ancestors might make an appearance since dream bubbles are memories and Gamzee hasn't seen the dark carnival and isn't dead and I don't think beforus had a dark carnival for Kurloz to remember...

Gamzee’s planet was the Land of Tents and Mirth and it’s been indicated the the dancestors’ planets were similar so I assume that they were in one of the Beforan trolls’ memory, possibly even Meenah’s.