This Sunday I'm co-hosting a SlateStarCodex meetup in Berlin. There currently seem to be a handful of cases in Berlin, so I'm wanting to take reasonable precautions.
I don't think canceling the event is reasonable at this point in time. At the same time I do want to have a policy of keeping potentially ill people away.
I have ordered a contactless thermometer. Most were sold out at Amazon.de, so if you want to hold any events in the coming months, now might be the last time to order. I also got normal mouth thermometers.
But I don't know about what values would be good cutoffs for fever testing.