Hey Dan!
Regrettably, I will not be making this Gathering.
I do however have some ideas that I think would lend well to the fights and the over all aesthetics of the environment. The idea of a wall is perfect but putting a large garage door in the middle of the wall would be killer! To help sell you on the idea, imagine it to be an awesome way to open a scene:
(garage door opens) - fighters inside ready to fight . . . .
(garage doog closes) - fights begin.
side-note: Every gathering I have been to this really adds to the concept. Kind of like shutting the octagon door at UFC. Once the door is closed, the fights begin and there is no turning back.
Not to mention how much of an effect it has when people go crashing into it! Sticks smacking it, etc. I think this has been some of the biggest crowed pleaser in previous gatherings that I have attended.
The second thought that I had was that the gathering for the Reality Show Promo had the view of over top which was really cool. Is there any way to give spectators the same type of angle? Maybe rafters or scaffolding?
Gruhn