Alright, so looking at the new dates for Tokyo2020, there are only three other multi-sports games who now find themselves in direct competition with the Olympics.
One is the Summer EYOF in Slovakia. I don’t see a reason to move this event, it’s for youth athletes anyway. Plus, the EOC don’t make a lot of revenue off the EYOF anyway.
The second event now in trouble is the Jeux De La Francophonie. The current dates are July 23 - August 1. Obviously those will have to change if they want any relevance. There is a TV market for these games, so it would be wise to move them. Personally, I want the games to moved into the window between the Summer Olympics and Summer Paralympics.
The third event in conflict is the World Games. They end on July 25, so I’d just suggest moving them a week forward.
If we did those changes, we’d have a sweet multi-sports games calendar for 2021. We’d have games essentially every day from early May to early September