From an organising point of view, and in my own experience, KEEP IT SIMPLE.
I wouldn't worry about food either, except pre-prepared cold dishes.
As for traveling with stock to cork, maybe one of the admin folks could organise with the Well delivery staff for homebrew to be collected from B&C at the same time of us recieving delivery from them. Easy.
Posters.
We've seen some funky labels created recently for homebrew tasting sessions, surely a poster is a small step up in design terms, and i know a very reasonably priced printing company, who might help us out cost wise.