Details and tickets come from the organiser (northalsted.com). Check with them before you go.
A crowd of more than 40,000 from across the country will converge on Halsted Street to celebrate the annual Northalsted Market Days®. This event is the largest two-day street fair in the Midwest and lives up to its reputation as one of the country's finest festivals! The event spans six city blocks, has 17 entrance gates and features three music stages with more than 40 musical acts performing. Many of these artists are top-name, national headliners, giving Northalsted Market Days® a reputation for some of the best live music in Chicago. Sourde: northalsted.com