I wonder how long until other international events start to be closed? I live almost trackside at a formula 1 event in a few weeks and I'm not exactly enthusiastic about people coming in from all over the world and cramming onto the public transport while they're drunk and sweaty.
It probably can't be contained anyway but large international events could cause some huge spikes in transmission.
Many major exhibitors are avoiding trade shows at least in the gaming industry, from what I've seen. Not the same as the show being cancelled but you can only have so many no-shows before it's the same in practice.
Considering Hokkaido became hotspot within two weeks of Snow Festival and Brazil recorded first case soon after Carnival, there is a good chance that other countries will start to look unfavorably at events with large crowd.
It probably can't be contained anyway but large international events could cause some huge spikes in transmission.