Hakon Soreide , Dec 16, 2007; 02:43 p.m.
What were your shutter speeds at full open apertures at ISO 1600. From that you can calculate whether for instance getting a f1.8, f1.4 or even a f1.2 lens might be what you need to get the shots... If the images include subject movement, which I assume it does since you're probably not taking pictures just of the room but of the people in it, that might be the only way to go.
If you need to push it even further, you can add exposure compensation to underexpose by one or two stops as necessary - it will give you noisier pictures as you bring the exposure up in post-processing, but it is still a lot better than blurry shots, and noise reduction can get rid of the worst of it.
High speed film might potentially turn out a lot more grainy than turning up the ISO in a digital camera...