Every two months, a group of visual artists, musicians and performers gather in galleries, garages, living rooms and at least one bakery within a tiny rectangle in the Mission (mostly four blocks by seven blocks, between 21st and 24th, Shotwell and Bryant) for the Mission Arts & Performance Project, known as MAPP. Saturday’s MAPP was an evening of lively, unpretentious, free art and music.

MAPP nominally radiates out from The Red Poppy Art House, where a group of local artists meet to organize it. But at its heart it is a profoundly decentralized, collaborative experience, a block party with less barbecue and bouncy castle, more listening to a live band in somene’s living room.