A reader sent me two BRG opportunities for Nashville, TN just in time for Bonaroo (these may be coupled with others I've found/others contributed a while back, if they're still around for your dates).
The Days Inn Downtown I posted here last Wednesday, so it may be a re-post for some.
Days Inn Downtown Nashville
Hotel Address: 211 North First Street, Nashville, TN, 37213 US
Competitor Website: http://www.hotels.com
Availability: Many dates through the summer, sample June 11-12 (in time for the Bonaroo music festival, if Nashville is on the way for you)
Occupancy: 2 Persons
Room Details: All room types
Rate variation: $89.00 Hotels.com, $99.99 WR
Special Comments: Great location in the heart of downtown Nashville. Enjoy.
The reader also contributed Super 8 Nashville - Museum. I cannot confirm that this BRG is still available, though. No time today to investigate, the beach is calling me, so I leave it in your hands.