location - indoor/outdoor?
if indoor how low the ceiling and what colour is is?
to reduce the recycling time of your flash you can up your iso
try to get an agenda of what is going to happen and at what time
this is so that you can be where the action is b4 it starts.
recce the location first and do a test shoot, decide what lens you need
get a zoom with a useful range, you do not have time to change lens
or use 2 cameras with different lenses.
1. flash. bigger the better.
2. if you arent allowed close to stage, you might want to consider using a longer telephoto zoom. 2.8 is good. if not & no image stabilising, be prepared to work at high ISO to get a reasonable hand holding shutter speed.
i suggest you go there early, but when all the lighting is on, and run through some practise shots to get a ballpark for what exposure settings you want to be working with.
if the lighting is going to be constant, can also do a custom white balance.
If you're the official photographer, you are allowed to go near the stage. Use a bounce card. UCC is about 6 storeys high. The stage ceiling is as high but they can fly some deflector boards for the sound but it's curved so cannot use it for bounce.