Thirty teams of barbecue authorities from across the Northeast will be converging on the center of town next weekend for a two-day competition for bragging rights. The Lexington Battle Green BBQ Festival is slated for 11 a.m. to 7 p.m. Saturday and noon to 5 p.m. next Sunday. Admission is $5, with ages 12 and younger admitted for free if accompanied by an adult; food costs will vary. The festival, part of the town’s monthlong Revolutionary Revelry lineup of events, will also feature musical entertainment, craft beer from New England breweries, and vendors selling grilling gear and accessories, with proceeds benefiting the regional LABBB Educational Collaborative. For more information, visit www.lexingtonbbqbattle.com.