Most conventions want 3 panel slots for a free membership and green room access. Usually, judging a masquerade counts as one slot. Most cons don't offer rooms to panelists, though some may let you crash in the Gopher Hole.
I've been a masquerade judge at 2 Duckons, a Windycon, a ComGlomeration, and a Tardis.
Re: Cool!
Most conventions want 3 panel slots for a free membership and green room access. Usually, judging a masquerade counts as one slot. Most cons don't offer rooms to panelists, though some may let you crash in the Gopher Hole.
I've been a masquerade judge at 2 Duckons, a Windycon, a ComGlomeration, and a Tardis.