Around the globe, more and more events were canceled or hidden behind closed doors, from the pope’s Sunday service to a Formula One car race in Bahrain to a sumo competition in Japan, where wrestlers arrived at the arena in face masks and were required to use hand sanitizer before entering. In Saudi Arabia, all schools and universities were to close starting Monday, following similar moves in central China, Japan and other Gulf countries. Questions grew about whether to maintain U.S. presidential campaign rallies and other potential “super-spreading” gatherings of people, as the virus entered new U.S. states.