The Southampton Artists Association Winter Art Show will take place from today through Feb. 26 at the Southampton Cultural Center. A reception is set for Saturday from 4 to 6 p.m. The Winter Salon Series at Malia Mills, a pop-up gallery in the clothing purveyor’s Main Street, East Hampton, space, will open a new group exhibition with a reception Saturday from 6 to 8 p.m. Harper’s Apartment, the Manhattan branch of East Hampton’s Harper’s Books, will open “Parallel Lines,” a show of 20 years of work by Don Christensen, with a reception for the artist today from 6 to 8 p.m.