Given that I plan trips to Japan specifically around TDR's event calendar, this means I probably won't be going to Japan more than once until at least Spring 2021. I really feel for people who bought annual passes specifically expecting to visit during each event though.
Right now, there is sort of a "pandemic event" that's on the level of the New Years (minus NYE) event. They have a character greeting type mini-show in each park and instead of food/merchandise, they have "rethemed" queues. I imagine that once they have shows again, they'll probably change parts of "Hello New York", "Let's Party Gras" and "Jamboree Mickey" for social distancing which could be a fresh experience. If they space people out on the seats, the viewing experience will be even better because traditionally, the slopes aren't quite enough to see over people for these shows. Definitely doesn't make up for the cancelled events but just a bit of silver lining.