A Memorial Service for Mai Cramer, longtime host of Blues After Hours on WGBH who died on Feb. 25, will be held on Saturday, March 30, at The Unitarian Church, 478 Main St., Winchester starting at 2 p.m. In lieu of flowers, donations may be sent in her name to the Pine Street Inn c/o Development Office, 444 Harrison Ave., Boston, MA 02118, or to Angel Flight, a nonprofit organization providing air transportation to people in need of medical treatment, c/o Lawrence Municipal Airport, 429 Sutton St., North Andover, MA 01845-1505, or any organization that helps women diagnosed with breast cancer.