This may start a Dropkick Murphys-scored riot, but we have to say it: Some of the area’s best Irish pubs aren’t even in Southie. Exhibit A : The Field, sited solidly in the People’s Republic of Cambridge, where white-, blue- and every color of collar convene for convivial times over perfectly poured pints of Guinness. The cash-only joint has pool, darts and a rare-for-Central Square rear patio that has us yelling “Sláinte!” all summer long.