I accidentally clicked null vote, so here is what I was thinking-
As it is, ctr-f will let you find just about anything you're looking for when it comes to specific announcements. They are mostly readable, a few might be too long. The real use of the wiki would be to tag them in a way, or put them in groups of similar content. For example, all heads contest announcements, all creature ones, all trial ones, ect. Overall, if it's going to take up too much space, I wouldn't do it. Not enough usefulness.