A colleague sent me a picture taken at the ESRI Developer Summit going on right now in Palm Springs, and I can tell you very few people are there.  Kind of looks like a ghost town.  Further, according to the DevSummit Twitter feed, ESRI decided to make it a virtual event and not a live in-person conference.

ESRI sent out an email today about the 2020 ESRI Conference that will be in San Diego in mid July.  This was at the bottom of the email:

Health and Safety at Esri Events: Coronavirus Response

In response to the novel coronavirus (COVID-19), we will be taking precautions at our events to protect the health and safety of all attendees. Please see the Esri User Conference FAQ for more information about current guidelines, event details, and assistance.

The conference is still on, but might change depending on the circumstances.