I'm thinking The Brewery at Olympic Park (Homebush) is the best option. You pretty much can't miss it when you get off the train at Olympic Park and I don't know of too many other options around the venue.

I should warn you though that when there are sporting events they serve $6 plastic schooners.
Anyway, I reckon those that are interested could meet up an hour or two before the undercard kicks off and have a few quiet ones before the action begins...
