I'm not sure if Alexis is participating, either. So it's actually kind of convenient that they ended up fighting each other.
Sorry everyone, I had a draining weekend at LARP and my storytelling skills are still not in top shape.
Attendants are there to tell avatars where to go for their battles, answer their questions, etc. There will also be an official, public announcement right before each battle.
Most of the people allowed near the area are volunteers of some sort. About eight medics for each arena, a handful of cameramen and other tech people, two announcers in the commentator's booth, two refs for each arena, and about fifteen other volunteers helping everything run smoothly (ideally :P). There are also about fifteen sponsors and public figures watching in the audience. All these numbers are humans and do not include any Pokemon these people may have. Each person has no more than one Pokemon out right now.
Everything is in one massive, cavernous room. A large but not completely floor-to-ceiling wall separates the two battlefields. You couldn't see the other battle unless you flew or something, but you could probably hear it. The area is shaped sort of like a bowl, so the audience can look down and see both arenas.