loving this idea and maybe will start one in seattle!

Sounds like a great idea:

Brown Bag Wine Night was designed to be a social, fun, wine tasting evening, in a teaching /learning environment – all done on a level playing field.  Unlike a double blind tasting where neither the varietal nor origin is known, we usually pick a red and a white varietal. The white varietal is tasted first, and then discussed, debated, agreed upon, disagreed upon, flaws noted, and favorites picked. And then red wines tasted, where more of same goes on. Invitees to this early evening tasting include an array of educated wine connoisseurs, tasting room staff, wine makers, bloggers, a few young adults eager to learn and the ones you may know- the twitter wine fanatics.

The brown bags are a nice touch.

Choosing the varietals in advance gives the evening a good theme and lets you focus on the tasting.