Aging Gracefully

-- The Young at Heart Chorus, made up of frisky senior citizens and the subject of a popular documentary, will perform for the first time in Boston. Only they don't sing Lawrence Welk. Sonic Youth and the Ramones are more their speed. Somerville Theatre, 8:00 pm. (CR)

Tree Hugging

-- How are you planning to spend solstice? If you do, in fact, have a ready answer to that, you might enjoy In The Groves: A Summer Solstice Journey. A noted storyteller/experimental theater artist and a Celtic harpist will collaborate to "spin tales of the human connection with trees and the deep meaning we have assigned to them through the ages." Arnold Arboretum, Jamaica Plain, 6:30-8:30 pm. $20 (registration required). (CF)

90s Parties

-- If you close your eyes tonight, you might think you live in a time when Bill Clinton is president, gas costs 75 cents, all rock is atonal, and you just bought your first Super 8 camera. Polvo has reunited, evidently, and the Raleigh, NC indie rock band shares the stage tonight with its Hampshire College counterparts, New Radiant Storm King. Middle East Downstairs, 472 Mass. Ave., 8:30pm. $14.

Places to House

-- When the first wave of Chicago house music ran out of ideas in the early 90s, Green Velvet kept the city moving. His dance tracks, which include incitements to drug use and ironic sampling, recall the stripped down electro roots of house, rather than its vamping, baroque excesses. (As Cajmere, he recorded the minimalist dance masterpiece "Percolator.") Even today, a new Green Velvet track remains hotly anticipated on the right sort of dancefloor. The Estate, 1 Boylston Pl., 10:00pm. $15.

Numbers of the Beast

-- You either bought your tickets to Iron Maiden six months ago or look with contempt on the people who did. Tweeter Center for the Performing Arts, Mansfield, 8:00pm. $35.00-$49.50.

Reggae

-- The Reggae Legends of Boston unites 11 different artists, mixes them up with a killer sound system, and offers you the opportunity to wine up on somebody. Western Front, 343 Western Ave., Cambridge, 10:00pm. $12.

C. Fersebner and Caroline Roberts contributed to this post.
Image of Green Velvet from his Myspace page.