Mass Concerts Presents: Flagman / Sumpp / CPS

A three‑band “Other” showcase featuring Flagman, Sumpp and CPS brings experimental sounds, genre‑blending compositions and off‑beat performance art to O'Brien’s. The venue’s raw atmosphere encourages the audience to embrace the unconventional, from noise‑infused interludes to spoken‑word moments. Each act pushes musical boundaries, offering a night of surprise and discovery. This event highlights the adventurous side of Boston’s underground culture.