The Dark Hollow Bluegrass Festival is April 1-2 at 6518 Brand Lake Drive, Waterloo. The two-day event features a dozen bluegrass bands. A $30 donation is suggested for the whole day Saturday, and kids under 12 are free. Music begins at noon. There will be food for sale by Leah’s Eats. Friday is a suggested $20 donation. Camping is welcome both nights (no electricity hook ups). Well-behaved dogs on leashes are allowed. Email taitrobertkelly@gmail.com for more information.