Our Revolution Cambridge will hold a City Council candidate panel from 6:30 to 10 p.m. Sept. 5 at Lesley University’s second-floor University Hall, 1815 Massachusetts Ave., Porter Square.  There will be 10 candidates out the field of 22 participating. Though the formal event is set to end at 8:40 p.m., a “mix and mingle” with candidates follows. Doors open at 6 p.m.