The Sierra Club - Lancaster Group invites the public to its annual potluck picnic at 6 p.m. on Sunday, June 21, in Lancaster's Long's Park, 1441 Harrisburg Pike, Lancaster. The event will provide an opportunity to learn about the local group of the Sierra Club, as well as to celebrate Father's Day and the first official day of summer.

Hamburgers and drinks will be supplied, and attendees are welcomes to bring sides and desserts. Yard games will be available, and picnickers may stay to see a concert by The War and Treaty at 7:30 p.m. The husband-and-wife duo performs Southern rock and other styles of music.

Attendees should look for the green Sierra Club sign at the top of the hill in front of the amphitheater. For more details about the potluck, email janedruce@gmail.com. Additional information about the Sierra Club - Lancaster Group can be found at http://www.lancastersierraclub.org.