I am just starting the planning stages for a two week 2020 trip to Japan. Planning on probably three days at Disney. A little worried about the Olympics that will going on that year in Tokyo. Planning on mid to late May or a mid September trip. Not sure if going before or after would be better or if it even matters.
I would almost be inclined to go after, assuming you've got a buffer period between your trip and the end of the paralympic games. If I'm remembering correctly, the beauty and the beast land is scheduled for a spring 2020 opening .I expect that might make the parks absolutely insane if it happens close to your May dates. But I also don't know how much a couple months will help that initial interest to die off. Just something to mull over
