From shufflers to aerialists, the Ultra Angels power Miami’s biggest electronic festival with precision and grit.

This week's selection of free and low-cost events in Cambridge and Somerville, including live music, a poetry book party, cross-cultural celebrations, and more.

This season has local bands, up-and-comers, and a few big names—not to mention the return of Mosh Madness and a rave on Pennsylvania Avenue.