Firstly, I have a huge queue of photos needing sorting and processing, which include some shots from the party...which I will upload eventually!
Thought I'd post about photography at the Great British Beer Festival last week - which always proves to be the most challenging location photographically for me every year.
As you'll see from the first pic (for information really, it's technically messy!), it's a nightmare of not-very-bright mixed lighting (white balance is always fun), bad backgrounds, hot spots, high ceilings and nothing to bounce flash off.
Initially, I tried using the flash, but with no bounce opportunities, found I was getting harsh foregrounds and too much drop off in the backgrounds (second pic). Forced to use ISO 800 and a wide aperture anyway to try and balance everything a bit more - with the associated noise - I figured I might as well try some flash-free shooting with the 50mm...and got some much better shots - like the third pic.
Interestingly enough, having snooped on the file info for the shots taken by the pro on the first day, he took a very similar approach - no flash and ISO 1250...his shots with a Canon 1D3 and rather more expensive zoom lens were outstanding considering the difficulties.

16-85@16mm, 3s, f/22, ISO100

16-85@38mm, 1/50s, f/4,8, ISO800

50mm, 1/50s, f/2.5, ISO800