Depends if you're using a flash, and how close you are. Flashes only work up to 5 feet away. The higher speed # film you use, the grainier your photos will look. If you're in the first few rows, I'd suggest sticking to nothing higher than 800. If you're more than 5 rows back, I wouldn't even waste the time and/or film to take any pictures, unless you have a great zoom lens.
I'm no photography expert, that's just my 2 cents based on my own experience!
