Every Sunday the South End’s sprawling SoWa market hums with live music as 250-plus artisans, farmers, and food trucks set up shop in the sun. Rotating brewery takeovers and a Street Stage soundtrack the browsing, with special sets like Boston Lyric Opera dropping in for an unexpected, gorgeous flourish on July 27. Street parking is free on Sundays, making it an easy, lively way to spend a summer afternoon.