The Guggenheim Collection Celebrates Itself and Its Art
LEAD: HARDLY since the Diamond Jubilee of Queen Victoria in 1897 has an anniversary been as thoroughly celebrated as the 50th birthday of the Guggenheim Museum. People by the hundreds danced, dined, drank, talked, reminisced. The staff got to forget what day it was, and virtually every foreign artist who has ever shown at the Guggenheim flew in to pay tribute to Thomas M.