(L to R) former Somerville Ward 3 Alderman Bob McWatters, Boston Mayor Marty Walsh, and Zac Zasloff at Senator Sal Didemenico’s St. Patrick’s Day Celebration on Friday, March 8, at the Charlestown Knights of Columbus. Several elected officials tried out their best jokes at the event that featured laughs, food and song, and included an Irish Dinner, music by Devri, bagpipers, comedians, videos and plenty of laughter.