5+ people are required for an orgy for this market, but it doesn't need to be a free-for-all (a swingers party would qualify). There must be at least 50% overlap with Manifest attendees, but it doesn't need to happen at the event or the venue. A day or two before/after in the SF region is fine.

I'm open to suggestion on what evidence we would consider. One person saying it happened without something to back it up certainly wouldn't be enough.