Shadowgraphs founder Bryan Olsen is an artist noted for his retro-psychedelic collages that recall 1970s album art — think the beam-splitting prism on Pink Floyd’s Dark Side of the Moon. His psych-rock band Shadowgraphs is the musical analog for those images, in which a swirling organ entwines with trippy guitars and ’60s Summer of Love harmonies to transport listeners into deep space. The show is an album release party for the band’s latest vinyl and digital LP, Venomous Blossoms.