The annual National Cherry Blossom Festival in Washington, D.C., is scheduled March 29 to April 12, but the blossoms are expected to peak the week before--sometime between March 21 and 28, Robert DeFeo, chief horticulturist for the National Park Service, said last week. For festival updates, visit the festival Web site at http://www.nps.gov/nacc/cherry or call (202) 547-1500. . . . The 12th Annual Tennessee Williams/New Orleans Literary Festival runs Thursday through next Sunday in New Orleans. New this year is a production of Williams' play "A Streetcar Named Desire" by a local company. Information: tel. (504) 581-1144.