From SXSW to San Francisco's gaming confab, the coronavirus is forcing tech companies and cities to make a tough choice with huge stakes: Cancel or let the show go on? (TWTR, GOOG, FB)

· The coronavirus outbreak has left tech companies and cities confronting a difficult choice ahead of a packed calendar of important industry conferences and events.
· Many businesses organize product launches and other strategies around certain conferences, putting months of planning and resources into the effort.
· But...