(A rosetta, by the way, is the flower shape that appears as frothed milk is poured into a cup of espresso. A pretty, well-defined rosetta is considered the mark of a latte art maestro. See examples here.)
Chef John Stephenson of Fido will be providing the food, and proceeds will be donated to Hands on Nashville. The coffee will come from Beve Mobile, an artisan coffee caterer. (Their website doesn't have much info right now, but you can check out their Twitter feed.)
Registration starts at 7:30 p.m. and amateurs are invited to participate. The hoedown and the throwdown start at 8.
Head down and enjoy sampling some of the losing entries. Caffeine's great — plan to be up a little bit late. I hear that Craig Ferguson dude is pretty entertaining.