Binary Brew

Binary Brew is the September Brew of the Month.

Source
This is only available to members of the Brew of the Month Club, which can only be joined during Brewfest.

All members of the Club get free sample of the brew in their in-game mail at start of September. Should you want more, your local Brew of the Month Club Brew Vendor sells it in stacks of six till the end of September. Before 2011, you could only access it until Brewfest started. You would then have to buy another membership form before the end of September if you wanted more during Brewfest.

On the first of September, members receive the following in game mail: