‘Saturday Night Fever’
Well, you can tell by the way I use my walk that I am heading down to the local theater in my best white polyester suit to see a special screening of “Saturday Night Fever.” For the film’s 40th anniversary, lovers of disco and Travolta can see the new, extended director’s cut, which promises more mirror balls, more Jersey and more finger-thrusting dancing.
Various locations; Sun. & Wed., 2 & 7 p.m., various prices, go to fathomevents.com for details and participating theaters.

‘Risk’
Director Laura Poitras took home the best documentary Oscar in 2015 for “Citizenfour,” about Edward Snowden. Now, she’s back with “Risk,” about WikiLeaks founder Julian Assange. Poitras spent six years getting the inside scoop on the exiled founder of the site, including his involvement in leaking documents that affected the 2016 presidential election; her work took a strange turn as she began to suspect the U.S. government was keeping tabs on her travels to London and back. The film has its D.C. premiere Thursday at the E Street Cinema, and the showing will be followed by a Q&A with Poitras. Beginning Friday, you can catch the film at Landmark’s West End and Atlantic Plumbing theaters.
Landmark E Street Cinema, 555 11th St. NW; Thu., 7 p.m., $12.

‘Contemporary Experiments in Animation’
You got a piano concert in my cartoon! You got a cartoon in my piano concert! The National Gallery of Art has taken a page out of the Reese’s playbook with this “cine-concert” called “Contemporary Experiments in Animation.” Composer and pianist Andrew Simpson will accompany abstract animations by 11 artists — many inspired by visual experimenter Len Lye, who died in 1980 — in a 60-minute treat for the eyes and ears. Included will be a premiere from artist Sharon Louden inspired by Lye’s avant-garde classic “Free Radicals.”
National Gallery of Art East Building Auditorium, Fourth Street and Constitution Avenue NW; Sat., 2 p.m., free.