We were thinking either early May 2022 or September 2022 so those dates should be ok if they have the celebrations for 15 monthsPersonally, I would go toward the middle of the celebration. If it's going to be only a year (although Disney years are often 15 months), the first month or two are going to be mobbed by people who can't wait for it, and the last six weeks will be with (most likely those same) people who need to experience it one last time.