10 people at Wards Ferry seems likely, 7 prereg currently including me (hope there's 11 though!). probably more at Slugapalooza with some crazy collegiates doubling back plus it being closer to civilization.
the problem is that people only do these races if theyre strong and like climbing. for some reason racers dont want to drive out to the middle at 430AM to pay money to be dropped 5mi into a 76mi race.