The D.C. public schools will hold a fair for individuals who have dropped out of school and would now like to finish.

The event is scheduled to take place from 10 a.m. to 4 p.m. Aug. 16 at the Washington Convention Center.

For more information, call 727-0445. Agencies Win Grant Money

Nearly 16 percent of $3 million in grants announced last week by the National Endowment for the Humanities will go to Washingon agencies and organizations for public programs.

The Folger Shakespeare Library will receive more than $20,000 for an exhibition and festival program on New World theater. The Institute for Puerto Rican Affairs will get $35,000 to offer a symposium on the cultural traditions of Puerto Rico.

The Jefferson Foundation will get $100,000 for a program on the U.S. Constitution commemorating the anniversary of the Bill of Rights. The National Council on Aging will receive $145,000 to develop a discussion program on the role of rivers in American life and more than $147,000 to develop other reading and discussion programs for older adults.

And the White House Historical Association will get $22,000 to develop a symposium and exhibit on the history of the White House.

Grant money from the endowment is aimed at increasing public understanding of history, literature and foreign cultures, and this year 23 projects nationwide were selected for funding.

The National Endowment for the Humanities is an independent federal agency that supports education, research, preservation and public programs in the humanities. Children's Stories on Stage

The Library Theatre will present original theater adaptations of three classic children's stories at libraries across the city next week .

The nonprofit group, whose mission is to encourage children to read, will present adaptations of "The Greedy Old Fat Man," a Japanese folk tale titled "The Tale of Woo and Hoo" and the Grimm fairy tale "Happy Ever After."

Library Theater has presented summer library programs since 1980. Last summer more than 5,600 children attended.

For performance times, call 291-4800. Improvisational Visitors

New York City's longest-running improvisational theater company, Chicago City Limits, will make its Washington debut at 7 p.m next Thursday in the Baird Auditorium of the National Museum of Natural History.

The presentation of the comedy team behind the television show "Reel News" is sponsored by the Smithsonian Resident Associate Program.

Tickets are $14 for members, $19 for nonmembers. For information, call 357-3030. Youth Orchestra Guest Conductor

Venezuelan maestro Fernando G. Zavarce will be the guest conductor of a D.C. Youth Orchestra concert of classical music at 7 p.m. tomorrow in the auditorium of Coolidge High School.

Tickets are $2.50 for adults, $1.25 for senior citizens and students. Coolidge High School is at Fifth and Sheridan streets NW.

For information, call 723-1612.