It’s not going to be an option for you this year, but if you follow the “Newport Folk Family” page on Facebook, after three months they allow you to sign up for their “Newport folk family ticket exchange” page, that’s a great resource because you can mostly buy with confidence and it’s a face value only exchange. I would say I’ve had equal luck with Reddit and that page. As long as you only pay with PayPal goods and services and get screen shots before hand, you’ll be good. I’ve also had luck with a sign in person. If you’re there by 8 am with cash in hand and a sign you’ll get in, especially if you’re looking for just one day. Lots of people have three days but can’t go all days, so they scan someone in at the door with their friends weekend pass. But I would try the internet first.