The Arnold Expo is officially cancelled.  Competitors will still compete, but no visitors are allowed.  I don't know if this marks the first major event (expected 250k) that has been impacted by the coronavirus, but this is definitely the biggest one.  Rumors of March Madness and Olympic impacts could be true soon...

https://www.nbc4i.com/news/local-news/dewine-ginther-set-press-conferenc...