ArtUnprimed, the pop-up gallery that occupies the Addo Women’s Clothing Collective on Sag Harbor’s Main Street, will open “Women,” its second exhibition, with a reception on Saturday from 6 to 8 p.m. The East End Winter Salon, an artists’ collaborative, will present its first exhibition, “What We Love About the East End,” from Saturday through April 2 at Kathryn Markel Fine Arts in Bridgehampton.