RICHMOND — A Minnesota bluegrass festival celebrates its 40th anniversary next month.

The Minnesota Bluegrass & Old-Time Music Festival will be Aug. 11-14 at El Rancho Manana in Richmond.

More than 25 bands are scheduled to perform over the four-day festival. Headliners include Pert Near Sandstone, The Travelin’ McCourys, Louisiana’s The Revelers, The Clay Hess Band featuring former Ricky Skaggs and Kentucky Thunder lead guitarist Clay Hess, traditionalists The Horsenecks, Seattle’s twin brother musicians The Canote Brothers and Minnesota’s Monroe Crossing.

The festival also features a marketplace, children’s events, workshops and dances.

Advance tickets can be ordered online. Tickets also can be purchased at the gate.