The competition and registration web sites came up this morning.

https://airtribune.com/santa-cruz-flats-race-mark-knight-memorial-2018/registration

https://airtribune.com/santa-cruz-flats-race-mark-knight-memorial-2018/info/details__info

Early entry fee is $250.

Payment button found here:
http://santacruzflatsrace.blogspot.com/