The new gallery Art Space 98 will open Saturday at 98 Newtown Lane in East Hampton. The inaugural exhibition, “People and Lost Traces,” which will open Saturday with a reception from 6 to 8 p.m., will include paintings by Thomas Buehler and clay assemblages by Rosemarie Schiller. Paton Miller, the Southampton artist whose work reflects his extensive travels and his admiration of such Spanish artists as Goya, Velazquez, and El Greco, will show new paintings at the Monika Olko Gallery in Sag Harbor from tomorrow through June 13.