Stanley Boxer: Gradations, Paintings from 1976 to 1984" at Berry Campbell, 530 West 24th Street, April 19 to May 19. Opening reception, April 19, 6 to 8.

"Walter Darby Bannard: 1959-1962," at the Institute of Contemporary Art, Miami, 61 NE 41st Street, Miami, April 26 to September 9. "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, June 9 to August 26. "Career-spanning show that examines the artist's tireless interest in the power and possibility of a single shape: the diamond." Summer Exhibitions Opening Night, June 8, 5 to 7 pm. Members, free; non-members, $15. Gallery walk with the artist, June 14, 6:30. Members, free; non-members, $8.

"Friedel Dzubas: Gestural Abstraction," at Loretta Howard, 521 West 26th Street, to April 21.

"Milton Avery: Early Works on Paper + Late Paintings," at Yares, 745 Fifth Avenue through April 30.

"Colors," at Freedman Art, 25 East 73rd Street, to May 12.

"Frank Bowling: Mappa Mundi," at the Irish Museum of Modern Art, Dublin, through July 8.

"Kaleidoscope: Colour and Sequence in 1960s British Art," group of 25 artists organized by Sam Cornish and including David Annesley, Michael Bolus, Anthony Caro, John Hoyland, Phillip King, Tim Scott, William Tucker & William Turnbull, at the Walker Art Gallery, Liverpool, through June 3.