Each year Cardboard Edison organises a game design contest. It is a great opportunity to get good feedback from multiple judges reviewing your rules and video pitch. Then a few designers are selected to send their prototype (to the U.S.A. for testing).
So, heads up: the Cardboard Edison Award contest is coming up!
Submissions open: Jan. 1, 2018
Final submissions deadline: Jan. 31
First round of judging: February
Finalists announced: early March
Finalist prototypes must be received: March 31
Finalist judging: April
Winner announced: late April
Check out their website for further rules and FAQ.