All the deadlines in one place to help keep it all straight:

Sukkot NW Deadlines
9/16/16 Last day to cancel campsite/yurt to receive 50% refund on camping fees. After this date, no refunds can be given on camping fees.
9/25/16 Lulavim Order Deadline (no orders can be taken after noon of the deadline)
9/25/16 Sukkot NW Registration Deadline is ON or BEFORE Sunday, September 25, 2016. Registration on or after 9/26/16 will require a $50 late fee.
10/10/16 Last day for late registrations so that we receive them before we leave for Sukkot NW. After that date, we are packing and preparing to leave for Sukkot NW.
10/10/16 Last day to notify us to hold Lulavim for you at Sukkot if you are not able to pick it up by the 2nd day of the Feast.

See Cancellation Refund Policy for more details.