re:
All the threads are closed. They close after one week and a new one opens to match the new theme.
Sam Sabri appears to be taking a week off from the contest because of the US holiday of Thanksgiving.
Watch this forum and when a new thread opens (probably Wednesday) you can enter that. For this forum (Photo Contests), they have waived the 10 post minimum to upload a photo file. Many contest entrants show as post #1. It is not only a way to show off the power and beauty of Windows Phone photography, it is a vehicle to attract new users.
While you wait for the contest to start up again, feel free to read and participate in the many other areas of Windows Central... and Welcome aboard.