"The next best thing to being in Munich" is, apparently, the Leavenworth Oktoberfest—which has now been moved to Wenatchee, but they've kept the name. Despite the Kevin Bacon-ness of that, this is still the most authentic celebration you're likely to find near Seattle, complete with official Oktoberfest brats, imported German beer and wine, live oompah and polka music, and performances from Bavarian dancing groups. They even have a full-on festhalle.