The organization wants to pack its renovated 4,500-square-foot black box theater and new 1,100-square-foot street-front studio with a community celebration.

“The Rocky Horror Picture Show” is back in Somerville on Halloween as a screen-and-stage experience and in Cambridge through November as musical theater – and in some ways the show has been here since 1984.

On Sunday, cuatro player Fabiola Méndez will open for herself – providing the soundtrack for the short film “Negrura,” a documentary she also produced.

Homer’s epic includes a cyclops, alluring but deadly sirens and a sea monster, but Kate Hamill’s adaptation roots out themes of war, trauma and forgiveness.