WORCESTER - Douglas Taylor drives a truck for the U.S. Postal Service in Shrewsbury. He heard about a walk-in equity COVID-19 vaccine clinic this weekend at work and made sure - really made sure - not to miss it. He set up a chair at 3 a.m. outside the YMCA on Main Street, but he wasn't alone. Someone had been there since 2:30, and others continued to line up around the parking lot before the sun came up on a beautiful spring day. "I wanted to get my shot," Taylor said while holding up his freshly stamped vaccination card. "I wanted to get relief."