Nintendo has announced that the Smash Bros. Ultimate Online Open May 2020 tournament, which was schedule for this weekend, is now postponed. The event will take place at a later date, but the specific date hasn't been specified yet. You can see Nintendo's statement on the postponement below.
In acknowledgement and out of respect to current events, we have decided to postpone this weekend's regional activity of the Super Smash Bros. Ultimate Online Open May 2020 tournament. We will provide information on a new time for this event soon.