The Baltimore Museum of Art hosts the 16th annual Baltimore International Film Festival tomorrow through April 27, featuring the world premiere of the made-in-Maryland "Two for the Money" Friday at 7:30 p.m.(301-685-4170) . . . Will Vinton, Academy Award-winning animator, makes an appearance at a free showing of his "The Adventures of Mark Twain as told by Huckleberry Finn," tomorrow and Friday at 8 p.m. in the Hirshhorn Museum auditorium (357-3000) . . . Madeleine Hage, associate professor of French at the University of Maryland and a film specialist, introduces Abel Gance's monumental "Napoleon" at a free screening at the school's Hoff Theatre, April 8 at 4 p.m. It runs 254 minutes, and "there will be an intermission," says a spokesman (454-4987) . . .

The NEA's Inter-Arts Program awards, "to assist in the presentation of multidisciplinary events," were announced last week, with grants going to three local groups: the Washington Performing Arts Society, $60,000; D.C. Curators, $15,000; and Roadwork, $9,500 . . . Sotheby's announced huge sales increases for the 1984 calendar year: 17.24 percent over 1983 in U.S. dollars, from $500,539,000 to $586,834,000. Sales increased 42 percent over 1983 in English pounds, to 477,000,000.