It's a pretty huge event, I think something like 100,000 visitors. It's mostly tech stuff, but there's a corner called Homegrown Village where I'll be.
Tip: get there early because traffic at this event is a bear.
(The robots walking around the fairgrounds are spectacular.)
It's Saturday, May 21st at 11:30 AM, at "Homegrown Village." Fair opens at 10 AM. More info: http://makerfaire.com/pub/e/6148