I guess I'm not the first person to suggest this but I'll elaborate on it
Please add #flamel to the list. It's a major component of Circus Maximus where people gather to play Pathfinder, Dungeons & Dragons, GURPS, etc., as well as the Circus Maximus original game Philosopher's Stone War.
Perhaps more importantly #fluodome should also be added to the list. It's basically the official Circus channel, where people play poker, cards against humanity, and real time games of mafia. It used to be THE major recruiting grounds for getting players into Circus Maximus.
Circus very much needs an activity boost, and adding these to the directory list, where they probably should have been long ago, would be a small but important step to helping.