Greater Boston is traditionally known as a hub of Irish-American culture: the Celtics, the Kennedys, the pubs called Murphy’s and Doyle’s and Clery’s. It may come as a surprise, then, that Beantown is in fact a great place for enjoying a very German celebration: Oktoberfest. Every year, venues around the metropolitan area put their own spin on the beer-centric festival (Boston does love its beer, after all), complete with steins and pretzels and lederhosen. Here are three spots to hit for this year’s festivities.