On September 19 from 6–9 p.m., the Lenox Hotel (61 Exeter St., 617-536-5300, lenoxhotel.com) becomes suds central when it hosts the second annual Back Bay Battle of the Breweries. For a $70 ticket, the sociable gathering of craft brew aficionados offers a special tasting glass, live music, hors d’oeuvres from the hotel’s chef and unlimited four-ounce pours from more than 20 New England brewers—including Castle Island in Norwood, Idle Hands in Malden, Night Shift in Everett and Lord Hobo in Woburn, along with returning champion, Braintree’s Widowmaker—as well as a smattering of cider makers for good measure. Besides bragging rights, the winner of an audience vote earns the right to take over the taps of the Lenox’s bars and restaurants for a night.