The astetics and color scheme of the the site aren't what the redesign is about. It's the functionality. Slapping a new skin onto what we already had would have taken a couple of days, not a couple of years.
It's the contest coordinator's job to add their events to the list. Now, technically there's nothing stopping you from doing it yourself, but it's probably something that could get you banned from the org (if the mods ever did that sort of thing anymore).