I am the opposite of a Gran Fondo racer, but I think endurance races are interesting and the folks what DO these races, mad props.
On YouTube, there is an Invictus info meeting for this ride. I find it very entertaining. It's about 55 minutes long, a PowerPoint presentation. The race starts in March.
Here's the website:
https://tinyurl.com/y89h36o4 Sound interesting? Here's the video:
https://tinyurl.com/yaz6z26b "Enduro Bob (Millay)" should have more info on this kind of riding.
Enjoy!