Riders self organize into groups, by skill level. I think the groups last year were 'beginner', 'advanced beginner', 'slow intermediate', 'intermediate', 'fast-intermediate', 'expert', 'extreme'. Newer riders should go in the beginner groups. Groups are led by folks who know the trails, and sweeps are there help folks as well.
I recommend coming out - there will definitely be a group for you!
Sorry to ask another "how hard/novice-suitable" question. I'm trying to figure out if the Steve Garnsey ride would be right for me. I had a great time on the aggressive DS ride at the Boogie and I'd love to go on another ride this fall but I don't want to get in over my head.
I'm in my first year of riding a WR250R on Shinko knobbies. The description of novice at http://bma1.ca/what-level-rider-am-i.php describes me pretty well. I am not fast. I can ride Limerick-like single track assuming no obstacles that require better-than-novice skills. I rode day 1 of the Algonquin 2 day, but skipped all the optional loops and took some shortcuts. I survived, but found it tiring, and was tired and slow as molasses by the end. I think my riding has improved since then.
The event info for the Steve Garnsey ride says: "On your first ride at Calabogie, select a skill level one level lower than you think you are capable of." Is "stay home" the right choice for one skill level lower than mine? Is there likely to be a group and route option suitable for me?