I have really mixed feelings here, and I'm just glad I'm not the one making these decisions.
NYC just cancelled the St. Patrick's Day parade.
On one hand I want to say this is, essentially, the flu on steroids. On the other hand, there is no vaccine to create a level of herd immunity, so more people will get sick - and contaminate others - albeit not necessarily seriously so. I recognize the heightened risks here.
But, that risk has to be weighed against the severe economic impact that cancelling sporting events, trade shows, conventions, parades, and the like will entail. Billions of dollars in salaries and taxes will be lost. People will be out of work and (small) businesses will suffer.
But, to @schillingfan's above post, the long term impact should only be 1-2 months. So we're not talking, realistically, about an infinite length of time.
All this to say, I don't know what the right thing to do is.