I don't like the two groups idea -- I'm all for meaningfully sampling a small number of beers, but I'd rather pick them myself. Wouldn't everyone else? Besides, beer at somebody else's table is always far more interesting...
As n1mbus has said, there's a lot of beer here and I think it would be wise to limit the amount being served. A litre per brewer? A litre and a half?
Obviously, pre-arranged swaps (or donations to the hard-working editorial staff) don't count.