prominent representatives of and performing arts--including conductor Leopold Stokowski and television producer David Susskind have agreed to discuss the case for support of the arts at the Quincy- Arts Festival on April 26, 27, . They will participate in three panels the present system of arts with private resources and for government grants to support. The first panel, moderated by Susskind on Thursday, April 26, will discuss whether the aid to the arts is needed and justifiable. On Friday, Daniel assistant curator of the Guggenheim Museum in New York City, will a paper to a panel debating the f art that government should . The third panel, scheduled for Saturday afternoon, the machinery for government support, particularly proposals Department of Culture and a Federal Arts Council, will be examined. Besides Susskind, members of the panel are Stokowski; Sarah , director of the Boston Opera Norman Singer, director of the Colo., Music Festival; and author Brelis.