Should I enable contest mode in this subreddit?
That depends. What kind of contest are you having?
It's a joke telling contest. I'm currently reading all submissions and I'm going to give a prize to the funniest joke.
Oh, that's a really cool contest to hold. Just make sure you take judging the entries seriously so you aren't wasting anyone's time. People would be upset if you just haphazardly chose a winner.
It's going to be fine, It is about jokes so I'm not taking it that seriously. I'm going to be deciding who the winner is.
But people participate in contests to win so taking it seriously is important. Otherwise why would they participate.