From Julius Caesar Ibbetson’s ebullient watercolor of “Skaters on the Serpentine in Hyde Park” to Édouard Manet’s textured monochromatic lithograph of a balloon, “In Celebration of Paul Mellon” is an exhibit whose scope reveals its benefactor’s profound impact. Mellon was a memorable 20th-century philanthropist and prodigious art collector, and the son of the great financier Andrew Mellon, who founded the nation’s art museum. Today, as visitors gaze upon works like Paul Cezanne’s graphite self-portrait and Pablo Picasso’s stark and haunting “The Death of Harlequin,” they view the gifts of a man who firmly believed that the pieces belonged to all Americans. Read more >>> The exhibition is on view Mondays through Saturdays 10 a.m. to 5 p.m. and Sundays 11 a.m. to 6 p.m., to Sept. 18, at the National Gallery of Art, 6th Street and Constitution Avenue NW. Free. (202) 737-4215. nga.gov. (Victoria Gaffney)

EAT THIS

Cava Grill‘s expansion continues with an opening today in Alexandria at the Shoppes of Foxchase. The Mediterranean fast-casual restaurant will offer free lunch at the new location from 11 a.m. to 2 p.m. today. Further openings are coming to Columbia, Md., McLean, Va., and Sterling, Va. Cava Grill, 4513 Duke St., Alexandria. cavagrill.com. (Jessica Sidman)

OH AND ALSO

Pioneering alt-country band Old 97’s takes the stage at 9:30 Club with Austin-based rock act Heartless Bastards and BJ Barham, the North Carolina singer and member of American Aquariums. 7 p.m. at 815 V St. NW. $30.

Distant Cousins, a folk-pop trio out of Los Angeles plays an intimate show at Sixth & I Historic Synagogue’s downstairs space. 8 p.m. at 600 I St. NW. $15–$17.

Filmmaker Ken Burns discusses his career and the evolution of documentary films at the Kennedy Center Concert Hall when he delivers the National Endowment for the Humanities annual Jefferson Lecture. 7:30 p.m. at 2700 F St. NW. Free.

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