I"m registered for the 40K on that Sunday, three-wheel division.
Registration fee is $40 total, regardless of how many things you participate in. The registration site is a little confusing, but you basically check the boxes for everything you want to participate in, including indicating your 2- or 3-wheel class. Ignore the "60-64" that seems to be present after every choice - no idea why that's there.
Jane Knight is publicizing the hell out of this on Facebook...