It is free and it is in GG Park. I believe GAMH has some connection to this festival as it is often mentioned in the weekly e-mails I get from them.
There's a little more info at www.strictlybluegrass.com and as I recall that site will be populated with more and more information as it gets closer to the date of the concert.
OMG. can I make it out there for this? with good seats, tho, not the ones on the sides where the musci is greatly distorted because of the Royce acoustics. learned that the hard way.