TOKYO – The only thing more difficult than staging next year's Tokyo Olympics in a pandemic might be convincing sponsors to keep their billions of dollars on board in the midst of economic turbulence and skepticism.To make the point this week, IOC President Thomas Bach will join a number of Japanese government and city officials, local organizers, and other top International Olympic Committee leaders in repeating a message they've failed to convey forcefully enough to deep-pocketed sponsors: Trust us, the Tokyo Olympics will open on July 23, 2021.Bach and IOC Vice President John Coates — who oversees Tokyo preparations — are expected to speak remotely to Japanese officials as they meet on Thursday and Friday.