I actually think it’s a bad idea for events to be cancelled just because some persons or places were devastated by an unexpected event (unless the event location or organizers itself was a victim and there’s no way they can re-organize it on time).
Even there was a calamity, life must go on. While there’s an intention of solidarity with the victims, it actually sends the reverse message - that we should wallow more in misery and not move on with our lives.
It’s actually better to establish normalcy as early as possible to make the victims feel as if nothing has happened. Cancelling the event them will just remind them that something went wrong and they’ll feel to be blamed for that.