I know this is a long shot

, but if I'm going to succeed anywhere on the web, it's here!
I've been asked to take some prom night pictures for my wife to be's cousin, next friday (26th) which I've agreed to do. Trouble is, I only have a 55-200mm f3.5 lens!
So I (very cheekily!) wondered if someone could loan me something for the night? Ideally, something with a wider aperture (f2.8

, f1.7

, f1.4

) and something 28mm or wider.
I'll cover all postage costs and bung a fiver to the lenders chosen charity, and obviously promise to take care of the equipment like it was my own (which is very well!).
I know it's a long shot, and I fully understand if no one wants to take the risk, but I thought it can't hurt to ask!