"40 YEARS" at The Gallery/​Art Placement, Saskatoon. Cast of all the finest artists who've shown at this distinguished venue in the past four decades (i. e, since it opened), through September 6. Sounds like a winner to us.

"Summer Selections," at Berry Campbell, 530 West 24th Street, Chelsea, through August 17. Beautiful show -- don't wait for our review of it, just go and enjoy.

"Abstract Climates: Helen Frankenthaler in Provincetown," at Provincetown Art Association and Museum, 460 Commercial Street, Provincetown, through September 2. Paintings done c. 1950, when Frankenthaler studied with Hofmann in Provincetown, and between 1958 and 1967, when she was married to Motherwell and summering with him in Provincetown. Expanded version of this show at Parrish Art Museum in Water Mill, NY, August 4 through October 27, 2019.

"Walter Darby Bannard: 1959-1962," at the Institute of Contemporary Art, Miami, 61 NE 41st Street, Miami, extended through September 22. "Focused presentation" of the artist's minimalist paintings, catalog by Michael Fried. Admission to the ICA is free but guests are encouraged to reserve tickets at the museum's website in advance of their visit.

"Darryl Hughto: From Diamonds to Sailboats," at the Everson Museum of Art, 401 Harrison Street, Syracuse, through August 26. "Career-spanning show that examines the artist's tireless interest in the power and possibility of a single shape: the diamond."

"Colors," at Freedman Art, 25 East 73rd Street, to August 17.

Jennifer Durrant, painting, and David Evison, sculpture, at Linden Hall Studio, 32 St. George's Road, Deal, Kent, September 1 through September 29.