This is a very nice festival where you can discover Hungarian culture through food, music, art, costumes and dance. If you stay late enough they will also be dance workshops where you can learn some moves. :) We went last year and had a blast. Bring a hat, in case it's sunny and cash for food and other purchases.
I'm going to be in Los Angeles for a wedding, so I won't be able to make it, but you should not miss this. Use the message board to coordinate meeting point and time.