Gathering of singles is forbidden as it will result in a mass orgy everytime!
I actually walked into a hotel room that had 6 single JW kids during a convention where exactly that was happening. Those 6 people were announced as DF'd from my hall the next week. Biggest regret now was not joining as the 7th person "floater."
Moral of story, gathering of sex deprived sheltered hormone rampant JW teens definitely WILL lead to a mass orgy!