Tech companies have canceled some high-profile conferences, causing an estimated economic loss of $666 million amid coronavirus concerns. Here's what's been called off so far.

· The coronavirus disease, known as COVID-19, is forcing tech companies to adapt as remote work and suspended travel become realities.
· Some of the biggest tech conferences of the year are being canceled as well, as companies heed the CDC's advice to "modify, postpone or cancel mass gatherings."
· Facebook's F8 conference,...