Age restricted sex clubs are not a new thing. If you ask me, they are doing the CDC a favor by staying (and spreading their pseudo-pandemics) within their own crop. Same goes for any of those sub-cultures.
When I worked in HIV/AIDS Prevention education, I learned a lot about that type of events. Also, I came across quite a few former (as far as I knew) JWs when we were doing outreach campaigns to places where people get involved in high risk behaviors. Same thing when we were on the streets talking to prostitutes. I also found a former JW in a recovery house.
JWs think of themselves as "not part of the world". It doesn't mean that's true just because they say so.