I have always wanted to reach out to you, if there is anyway I can support with the contest because I know how tasking it would be for you to go through all the entries.
It would be best to have a group of people who are willing to work with you in organizing and grading.
People are coming on board everyday and the responsibility will get bigger. I will volunteer to be part of the group if this idea works well and about the reward, it doesn't have to every contest.