Event Volunteer – Welwyn and Hatfield Bumper Day  – 17th May 2026 You can make a big difference in just a few hours.  We’re looking for enthusiastic volunteers to support our next Cancer Research UK  Welwyn and Hatfield Race & Pretty Muddy  , on the 17th May 2026. Whether you’re coming solo, bringing a friend or part of a larger group, your support means our event can run smoothly and raise money to fund lifesaving resear…