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Halloween, with its costumes and supernatural element, is about exploring alternate realities—or ”other planes of there,” in the words of Sun Ra, who also trafficked in costumes and the supernatural. This year marks the 100th anniversary of Ra’s “arrival:” The jazz composer, pianist, and big-band maestro insisted that he was born on Saturn and arrived on Earth in 1914. He built a complex mythology around ancient Egypt and Ethiopia, religion, numerology, and the cosmos that he liberally infused into his experimental music and his band, the Arkestra. It was only partly a matter of spectacle: Ra’s fellow travelers were true believers, and, since they continue to perform together more than 20 years after their mentor’s 1993 “departure,” still are. Doubly appropriately, their D.C. appearance on Halloween night features a costume contest for the kids so the whole family can enjoy the far-out musical celebration. The Sun Ra Arkestra performs at 8 p.m. at the Lincoln Theatre, 1215 U St. NW. $20. (202) 888-0050. thelincolndc.com.