"A Downtown Holiday Film Celebration" is featuring screenings Saturdays at the Harris Theater, 809 Liberty Ave. The film this Saturday will be "How The Grinch Stole Christmas" (2000) with Jim Carey. Sponsored by the Pittsburgh Cultural Trust, Pittsburgh Downtown Partnership and Pittsburgh Filmmakers, films will be shown Saturdays through Dec. 20 at 2 and 4:15 p.m. Tickets are $6 per person per film; an advance family package for $20 guarantees four seats to the movie. Tickets are available at the box office at Theater Square, 655 Penn Ave., or by calling 412-456-6666.

Rangos Omnimax Theater at the Carnegie Science Center, One Allegheny Ave. next to Heinz Field on the North Side, is showing "Mummies: Secrets of the Pharaohs," "Wild Ocean" and "The Alps." "The Polar Express: The IMAX Experience" will be shown at limited times starting Monday and continuing through Dec. 31. Admission cost varies. Omnimax is not recommended for children younger than 3. Call 412-237-3400 for show times.

<B>Tuesdays@2</B> free movies is scheduled to show "Dark Knight" featuring Heath Ledger in his final film at 2 p.m. Tuesday in the Kean Theatre at St. Barnabas, Washington Place, 5847 Meridian Road. At the same site, Wednesdays@1 will show "Wanted" with Angelina Jolie and James McAvoy at 1 p.m. Wednesday. Admission is free to both, but donations are accepted to benefit the St. Barnabas Free Care Fund. Call 724-444-6288.