Originally posted by TOUGEFC Tell me about it!
Im getting there early so i can test various set-up's.
It's great that you have this opportunity beforehand. If the ceiling is white, you might also try mounting your flash on the light stand, no umbrella, bounce the flash off the ceiling.
After you shoot with off-camera flash, I would recommend you try a very simple setup; use your flash on the camera. Take a meter reading with ambient light only, then use similar settings with the flash on and fllash compensation set for -1 or -2 Ev, to let in a lot of ambient light. Use an Omni-bounce or even the flash built-in diffuser. This will give you a very different look than the off-camera lighting, and also gives another opportunity to keep everyone for another little session, "Hey everybody, before you go, I just want to try one more thing". A second or even third lighting setup gives you more photos to choose from and a good excuse to continue.
PS Prepare or add-lib some one-line jokes and shoot a couple while people are laughing.