Speaking of Franconian Beer, I'll add a couple:
Annafest in Forchheim July 21-30. Forchheim is just a bit farther north than Erlangen. The fest is on the side of a hill with 20+ beer gardens (serving beer from a dozen or so breweries)
Sandkerwa in Bamberg, August 23-27. Bamberg is the beer capital of Germany -- don't let anybody from Munich tell you different! (9 breweries in town, 50+ in the nearby villages). This is held in the winding streets of the old town of Bamberg. All 9 local breweries are represented plus many from surrounding towns and villages.
Being smaller towns, the vibe is different than Oktoberfest, the "Berg" or Nürnberg, but I think you'll find the beer to be much better. But then I am biased.
Lots of discussions of these at
www.FranconiaBeerGuide.com (disclaimer: that is my site)