You don’t need to be a Charlestown resident to take advantage of the Navy Yard Bistro & Wine Bar’s Sunday and Monday "Neighborhood Nights.” A lively, local crowd watches football while enjoying $6 cocktails and $12 entree specials (e.g. shrimp scampi; meatloaf with mashed potatoes and green beans and red wine mushroom gravy) that are offered all night. And its regular menu contains plenty of bargains as well – where else in Charlestown can you score steak frites for $17 (617-242-0036)?