I'm thinking bring 2 kegs of the same high quality light beer, and do something slightly more adventerous in the other two. A dry stout may be ubiquitous enough that people may recognize it as being like a Guiness. The other could be a mildly hopped pale ale, or perhaps a Belgian Single. Basically make a pilsner but pitch 3522 Ardennes yeast. Makes a great subtly complex light ale.
Fermenting: Bob's Your Enkel!
In Bottles: Beauty In Dirt IPA, Kinslayer Saison, Timmy D. Stout, Territorial Goose Brown Ale