Boston's largest music festival, returning June 4-6, 2027 at the Harvard Athletic Complex in Allston after a 2026 hiatus. Three days of indie, rock, pop, and hip-hop performances on multiple stages, plus food vendor courts, sponsor villages, and bars. Annual since 2013 (founded as a Boston City Hall Plaza event, moved to Harvard Athletic Complex 2017). Approximately 40,000 attendees per day. Operated by Boston Calling Festival.