Silver Spring resident Merv Conn was honored at the Central High School Alumni Association's annual reunion. Conn, a 1937 graduate of the former District high school -- at 13th and Clifton streets NW, now Cardozo High School -- and several other former graduates were recognized for "notable achievements." Conn, an accordian and organ player, directs his own music school and performs locally. During his career here, he performed for President Harry S Truman at the White House and the Washington Senators at RFK Stadium. Snowplow Operators Win Competition

Wayne Hane of Frederick and Robert L. Shifflett of Clarksburg placed first in the Montgomery County Department of Transportation Snowfighters "Roadeo," which recognizes skill in snowplowing, knowledge of the equipment and observance of safety rules. The competition included a written exam on safe driving rules and snow removal operations, a safety inspection of equipment and a driving test. Each won an all-expenses paid trip for two to Disney World. Twenty teams of two men each participated in the competition for department employes. Women Artists Name Md. President

Vilma Janke Grace of Potomac has been named Maryland state president of the National League of American Pen Women. The Washington-based NLAPW, with more than 6,000 members, promotes the development of professional women artists, writers, dramatists, lecturers and composers. Grace is a professional painter and a cookbook author. Community Service Award Given

The Montgomery County Interagency Coordinating Board for Community Use of Educational Facilities and Services (ICB) has awarded Gaithersburg resident Janet Voelker its annual Donald R. Spivack Community Education Award for 1985. The ICB award recognized Voelker's work in helping the Laytonsville Elementary School become a focal point for local community education and activities. The recent family film night, dinner with county education officials and a spring festival and luncheon at the school were organized by Voelker. She lives on Exodus Lane. Advertising Executive Lauded

Nella Manes has been honored with the Washington Area Broadcasters Association's Friend of Broadcasting Award. The annual award recognized Manes' "significant contribution to the development and growth of radio and television" through her promotion of radio and television as an advertising medium. Manes is president and chief operating officer of the Bethesda-based Ehrlich-Manes Associates advertising and public relations firm. She lives in Chevy Chase. New Housing Commissioner

George Dines Sr. has been appointed to a five-year term as a commissioner of Montgomery County's Housing Opportunities Commission. The seven volunteer commissioners determine policy and approve budgets and bond issues for the 20-year-old agency that owns, manages and finances housing for low- and moderate-income residents. Dines, who lives in Silver Spring, is associate administrator of international affairs of the U.S. Department of Health and Human Services.