Last time we saw her at Oberon, Lea DeLaria wielded a mean baseball bat as a bullying demigod in the Steven Sater-Serj Tankian rock opera “Prometheus Bound.” Now the comic, actress, and singer is returning to Harvard Square as — wait — a children’s entertainer? Her interactive jazz musical “Boom Boom’s Bow” will have two performances at Oberon on Sunday afternoon for children ages 3-10 and their parents.
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