On arrival, pack and store medical accoutrements such as gloves and facemasks, as these may cause undue anxiety among TV viewers of the event.
When greeting other participants, shake hands vigorously and depending on your relationship embrace or kiss them. Wrapping a hand and arm around a colleague's shoulders will convey a sense of solidarity.
Wash hands before and after the event.
If questioned by the press, convey sincerely that you perceive no health emergency.
The most important thing you can do in this difficult time is to make Pres. Trump look and feel good. Have confidence that many Republicans will survive, and isn't that what really matters?