A convention, by contrast, is almost certainly not itself an on-premises establishment. In the public spaces (probably a hotel) everyone has to act in accordance with local laws and regulations which will generally preclude most of the stuff that would necessarily violate social distancing concerns. The convention likely blocked out entire rooms of the hotel for their eve.
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Of course, it is a swinger convention and people who attend are probably looking to swing. In the convention itself people will meet and negotiate whatever parameters they want and assuming deals are struck, they would then retreat to rooms they were renting in the hotel.