Can Single People Go to Key Parties?

i don't understand how the key party is organized. So, having never been to a key party, can single people go to key parties? To me, it's like the early days of fantasy football. I think there probably was a single guy ke party loophole there for a couple of years. Or if you'red the single guy or lag out te kep, i don't think there's an atom silver whoseso.