Your chills will be multiplyin' this weekend -- if you're a fan of Grease, that is, the movie and the musical. You can see two different screenings of the 1978 movie starring Olivia Newton-John and John Travolta: A standard showing to conclude Atlas's Movie Musicals series, and a new "Sing-A-Long" 35mm print at the American Film Institute's Silver Theatre. And a production of the musical that started it all has been extended through this weekend at Olney Theatre Center. Ah, young love in the summertime. Grease screens Friday, Sept. 2, at 8 p.m. Atlas Performing Arts Center, 1333 H St. NE. Tickets are free, except for a $2 booking fee. Call 202-399-7993 or visit atlasarts.org for a full schedule. The Grease Sing-A-Long is Friday, Sept. 2, at 7 p.m., Saturday, Sept. 3, at 2:30 p.m., and Sunday, Sept. 4, at 5 p.m. AFI Silver Theatre, 8633 Colesville Road, Silver Spring. Tickets are $11 general admission. Call 301-495-6720 or visit afi.com/Silver. And the musical Grease runs to this Sunday, Sept. 4, at Olney Theatre Center, 2001 Olney-Sandy Spring Road, Olney, Md. Call 301-924-3400 or visit olneytheatre.org.