Citroens at Carlisle 2017 REGISTER BEFORE APRIL 17 TO SAVE $ Citroens at Carlisle 2017 Click on the above link for the Citroens at Carlisle 2017 flier. be sure to preregister your car with Carlisle Events by April 17 to save $$. plan to attend, and be sure to RSVP for dinners prior to deadline.