Paula Nelson, artist and former head of the Woodstock School of Art (WSA), recalled the first time she met Bob Angeloch, the late WSA co-founder and painter being celebrated with the first of a two-part series of retrospective exhibitions opening 3 p.m.-5 p.m. Saturday, July 7. It was summer 1966 and she had come to Woodstock when she learned she could utilize the Ford Foundation grant she’d just received to study painting at the Arts Students League campus in Woodstock, which the WSA now inhabits.