The United States Film Festival is slowly gaining momentum and will probably hit its stride about mid-week as the crowds grow larger and the theaters seem to grow smaller.

Sunday, the second day of Park City's FilmFest activities, will doubtless find theaters still selling tickets at the door for most films, and that is usually the case for Monday and Tuesday as well.For movies later in the week it's a good idea to have hard tickets in hand, though any film may have a few empty seats for those willing to be in line on a standby basis before the start of the movie they want to see.

Sunday's schedule includes a seminar on "Low-Budget Production," as well as the expected mix of John Cassavetes-directed films (his ground-breaking first film "Shadows," and the more mainstream "Too Late Blues"); the first programmed "Salute to Jay Ward," with such animated delights as "Bullwinkle's Corner," "Fractured Fairy-Tales and "Dudley Do-Right"; the Charlie Chaplin feature "Limelight" (with features Chaplin's only pairing with Buster Keaton); and a couple of the Latin films based on stories of (and co-scripted by) Nobel Prize-winning author Gabriel Garcia Marquez - "The Summer of Miss Forbes" and "Letters from the Park."

There are also a couple of "premiere" films, "Part Two" of the Ben Kingsley HBO biography "Murderers Among Us: The Simon Wiesenthal Story," and the Sundance Institute's out-of-competition documentary "Yosemite: The Fate of Heaven," with Robert Redford as executive producer and narrator.

"Yosemite" is Sundance's first attempt at film production and Redford said the idea was to do more than merely chronicle the history of Yosemite. "We want to elevate the experience so it is not just straight education as much as the emotional experience around it."