Community-minded people interested in gardening and other horticultural activities are being sought by the University of the District of Columbia's Cooperative Extension Service of its 1978 Master Gardener Program.

Participants will be trained by horticulturists, plant pathologists and entomologists to assist area residents in urban horticulture. They will take 50 or more hours of classes at the extension service. In return, they will be asked to give a minimum of 50 hours of their time to the community this summer and fall.

Classes begin this month and continue until May. They meet twice weekly for four hours each day. For more information, call 282-7400.

Cleveland Park is the subject of a book recently published by American University. The Northwest neighborhood is noted for its trun-of-the-century homes.

Developed from an AU seminar on historic preservation, the book focuses on the growth of the area and its social and architectural history. "Cleveland Park: Washington, D.C., Neighborhood, historic Research" was co-authored by Louise Mann Madden and Sheila Dressner Ruffine. Sarah White Hamilton had assisted in the first, limited edition: The paperback book is available at the university bookstore in the basement of Anderson Hall, at the Smithsonian Arts and Industries Museum and at Renwick Gallery. For information on ordering, call the AU bookstore at 686-2665.

A food service program to assist qualified public or private non-profit organizations in providing nutritious meals for children during the summer months has been announced by the D.C. Public Schools Food Services Branch.

An organization may be eligible to sponsor the program if it: provides ongoing, year-round service to the District community; will conduct a regularly scheduled food service program in areas where 1/3 of the children are eligible for free or reduced-price national school lunch meals; qualifies as a camp; serves children 18 years of age or under, or mentally or physically handicapped people 18 or older who participate in public school programs; and does not discriminate against any child because of race, sex, creed, color or national origin.

Interested people should write or call Doris B. Crosson, D.C. Public Schools, Food Services Branch, 3535 V St. NE, Washington, D.C. 20018 (576-7404).