While Ben 10 Planet is a GREAT WIKI, and its great to have the community come together for stuff. There's run down parts of every wiki, so why not support the community to edit a certain part of the wiki and make sure its top-shape?
That's where the TOPIC OF THE WEEK comes in. With the TOPIC OF THE WEEK, one admin chooses a topic for the week, and during that week editing pages related to that topic are supported. Prehaps a reward or something for the user who makes the most edits to that topic?
While choosing the topic, I would maybe use the categories to help decide what it should be. I would also recommend one topic being timelines of events in the franchise, as I've noticed those seem to be a bit run down. Anyways I'll let you guys decide if you'd like it or not. Just trying to help.