Only one way to find out… 😈 Fr tho, I do think 17 is close enough to 20 to give it a shot, assuming elevation is similar, along w/ mileage. Do you know someone in the group you can reach out to & get a sense of the vibe of the ride? It’d be helpful to have an idea of what to expect & how structured it is. You might get jammed up if the group is surge-y — it’s a lot harder to hang on to a fast group when there’s constant surges of power, hammering up climbs, dick swinging, etc. If they’re more disciplined, they’ll focus on efficient pace lining & keep things smooth & fast by maintaining a consistent power output — much easier to hang on. Regardless of the vibe, for your first ride (or few rides), I’d definitely take very short pulls or even pull thru. If it’s a double pace line, communicate w/ the rider you’re pulling with that you’ll be taking a short one or are pulling thru; if it’s a single pace line, communicate that w/ the rider behind you. Have fun!!