Save The Event For Later 2011 Twilight MTB Crit Series - Part 1 & 2 (4 Races Each) Grass Valley, CA, Tue Jun 21 - Tue Aug 9, 2011 Who's Registered? | Contact Event | Event Website | Google Calendar Start line address: Grass Valley, CA 95959 Presented by Youth Bicyclists of Nevada County (YBONC) Fdn. USA Cycling Permit # 2011-1647 This is a past event. If you wish to see the details for this past event click "Continue" below. If you are looking for a current event, please search the event calendar .