All great questions!
Don’t let the idea of ‘Enduro Challenge’ intimidate ya, it’s simply trail riding with timed descents. Riders are well spaced apart and in like-skilled groups for seeding so little risk of getting caught on runs involving 2-300 metres of elevation drop.
I had a convo earlier today with someone:
“I’m not sure I’m fast enough to race an enduro.”
“Do you like to go out with your buddies and rip trails?”
“Yeah, sure, we do that every wknd!”
“Well then, you’re already enduro’ing! Don’t overthink it, it’s simply trail riding. Don’t feel like ripping at your limit? Throttle it back. Don’t want to get air on the jumps? Just roll 'em. Don’t care about your results? NP, don’t look at them.”
As for the many Q’s of "do I need a fullface? Can I take the shuttle up? Can I switch bikes btwn runs? Will I get mowed down by a faster rider? , etc I expect that the organizing committee will release guidelines and rules shortly to answer all of these. It’s fairly straightforward, common sense stuff but it’s good to familiarize yourself with the info beforehand.
Ultimately it’s all about the fun factor and ripping bikes with friends is fun so when you can rip bikes with 75 to 100 friends it’s that much more fun!