The Watch City Bike Lab grew out of a pop-up appearances at the Waltham Farmers' Market last summer. The lab provides the space, tools, and assistance to empower people of all backgrounds and circumstances to repair and maintain their own bicycles for free or at nominal cost.

It is located just inside the door of the Charles River Museum of Industry and Innovation.

The lab plans to open from 10:30 a.m. to 2:30 p.m. on the first and third Sundays in April and May.

You can learn more at watchcitybikelab.org.