I believe what happened with the Gazebo is that Katsucon got double booked and the Jewish youth group kids did technically pay to have the Gazebo space but I think the youth people are still allowing con goers to use the space. IDK what that actually looks like as I'm not at the con yet.
I would tell your shoots to meet at the Gazebo and if it being used by youth members then to "meet and move." Lets just try to share the space considering there is gonna be 500 extra people at the con. @_@