The Boston Calling Festival started last year, and this year’s edition, which comes to the city next month, boasts one of the most vanilla festival lineups we’re likely to see this year (which is some kind of achievement). But the festival is apparently successful enough that its organizers have added a second weekend later in the summer; it’ll come back to Boston’s City Hall Plaza 9/5-7. And this time around, the lineup is significantly more interesting. This bill won’t cause anyone to keel over with surprise or anything, but there’s a lot to like from top to bottom. The headliners are the National, Lorde, and the reunited Replacements. And there are lots of good bands further down the bill: Nas with the Roots, Neutral Milk Hotel, Spoon, Girl Talk, Volcano Choir, the War On Drugs, the Hold Steady, Future Islands, Sky Ferreira, White Denim, and S. Carey among them. Even in terms of the standard festival fare, the bill has some nice things happening; I’d take Childish Gambino and the 1975, say, over Edward Sharpe and Bastille any day. Check out the details on both festival weekends here.