This little tidbit is buried in the Prep calendar only:

*Contest Round entries may be any rating. Submit your ITEM or ENTRY number by 1200 noon WDC time on Sunday to compete. WDC time is New York City time and can be found at the top of the IM Console. If you miss this deadline or choose not to compete, you must still log the assignment complete (without linking your work) for the grand prize, per the standard Prep guidelines.

I hope you made it on time. If not, make sure you still log the assignment in the LOG so you still get credit for doing it.