Somerville’s porches, yards, and stoops once again presented free mini-concerts across the city last Saturday as part of the city’s annual Porchfest, hosted by the Somerville Arts Council. This celebration of local, live, homegrown music offered something for everyone at drop-in home-based shows. Participants simply strolled from house to house to enjoy the open-air entertainment. More than 300 bands participated across wide-ranging musical genres from youth playing classical music to electronica groups, karaoke, and – a first this year – stand-up comedy.