Bring a large diffuser of some type. Sounds like you'll have people there who can help out and hold stuff for you. Calumet sells one or Backdrop Outlet with a frame and translusent panel. Check them out.

__________________
Always think positive, but expect the worst and nothing bad will ever happen.

http://hanratty.smugmug.com

Gear:
Olympus E-30
Olympus 14-42mm f/3.5-5.6 (28-84mm conversion)
Olympus 40-150mm f/4-5.6 (80-300mm conversion)
Olympus 70-300mm f/4-5.6 (140-600mm conversion)