text: Pilgrims Crowd Field for Mass With Pope LOURDES, France - A frail Pope John Paul II celebrated an open-air Mass on Sunday as several hundred thousand pilgrims, many in wheelchairs, crowded onto a field near a French shrine to the Virgin Mary that is associated with miraculous cures of the sick.    The Mass was a highlight of the Pope's two-day visit to Lourdes, a town in the Pyrenees where Roman Catholic tradition says St...