Now an annual traditon, Sweetgreen’s Sweetlife Festival brought 25 artists to Merriweather Post Pavilion this weekend for more than 22 hours of music over the course of two days. The festival’s three stages hosted all manner of bands, from the Pixies, who started playing in the late ’80s, to Bleachers, who just formed last year. Headliners included Calvin Harris and Kendrick Lamar, and Tove Lo played one of the best sets of the weekend.