The Sixth Annual Great American Cleanup of Mansfield is set for 9 to 11 a.m. April 27, and organizers are already working on their list of volunteers. Last spring, 700 residents turned out and donated about 2,000 hours, cleaning up litter from roadsides, parks, and school grounds. The deadline to register for this year’s cleanup is April 12. The first 500 volunteers to sign up will receive free T-shirts. Do so at www.keepmansfieldbeautiful.com, the Parks and Recreation Department, or at Town Hall. Keep Mansfield Beautiful is also looking for financial support from businesses to offset costs of running the annual cleanup.