It’s a tough call.
Domestic flights are supposed to be fairly safe, at this point. Will have to see how that changes closer to the conference. Also, those coming from other countries usually have to take a domestic flight to Nashville (not many will be direct international flights into Nashville). So you could wind up on a flight with travellers from more heavily infected areas. It would be great if they could screen/test people for the virus at the airport and not allow them to board if infected. But that’s probably not very feasible.
I’ll be driving to the conference, if it goes on, so I don’t have the flight problem. But then we’ll all be gathered in groups for extended periods, and it’s difficult to assess how risky that could be, as the experts still aren’t completely sure how it is transmitted, and at what stage it is transmittable. Right now they think it is mostly only transmitted when an infected person is sick (fever, cough), but they haven’t ruled out transmission before symptoms manifest.
Of course, we hope that anyone exhibiting any symptoms will stay away, and any that develop symptoms while there will leave. But there’s no guarantee. I can easily self-quarantine after returning home to determine if I picked it up, but not sure if everyone else who attends can or will do that. The responsibility of conference/gathering leaders is not only to keep their attendees from becoming infected, but also to prevent infections from returning to individual communities and thus increasing the global spread.