The 36th annual Telluride Bluegrass Festival will be held June 18-21 in the San Juan Mountains of southwestern Colorado.  So far, these bands will be performing the festival: 

Dixie Chicks
Yonder Mountain String Band
Zac Brown Band
Bela Fleck
Railroad Earth
Jerry Douglas
Peter Rowan
Tim O'Brien
John Cowan
Punch Brothers
Edgar Meyer
Todd Snider
The Steeldrivers
The Greencards
Mike Farris
Blue Canyon Boys
Kasey Chambers

...and more to come soon. 

For four days, Telluride Bluegrass attracts more than 10,000 "festivarians" from around the world to the historic mining town of Telluride (population 2000), nestled at the end of a box canyon in southwestern Colorado. With non-stop music on the main stage, intimate workshops, late-night "Nightgrass" concerts at every indoor venue, and jam sessions in condos and campgrounds, Telluride's 2009 acoustic adventure continues the tradition as one of the world's great music festivals.  For more info, check out the festival website.