Photo by Tony Quinn.

LANGUAGE: Learn the basics of Basque, an “endangered language with only around 600,000 speakers.” Petworth Citizen & Reading Room (829 Upshur Street NW) 6:30-8 p.m. Free .

LENNON: The Martin Luther King Jr. Memorial Library screens Danny Collins, starring Al Pacino as the “aging rocker whose life changes when he discovers a long lost letter from John Lennon.” (901 G Street NW) 6 p.m. Free.

BROTHERS: Award-winning journalist, Masha Gessen, discusses her new book, Brothers, a story of the Tsarnaev brothers. (625 Monroe Street NE) 6:30-8:30 p.m. Free