The "Occupation" wording in the sitenotice was based on the "Occupation" page on the official site, basically to mean that the entire "Occupy Portland" event/demonstration begins at 12pm at the waterfront. But I can see that that wording might be confused with the "full occupation" which begins after the march at an undisclosed location. So I went ahead and changed it to "Occupy Portland" which is a little less punchy but more accurate. If you need to make any other changes to it, the place to edit is MediaWiki:Sitenotice. As a general reminder to everyone who may read this, be extra careful with edits to that, as it's at the top of every single page of PortlandWiki.
I agree that a page like Occupy Portland - Behavior or Occupy Portland - Newbies would be good prominently linked at the top of the Occupy Portland page, for example: IMPORTANT: How to protect yourself and others
Is there a page that lists important guidelines like those you mentioned, so we can get the "expert" wording as I am not one and don't want to unintentionally mislead anyone?
Not sure what you mean by communications model so I will leave that to someone else to answer.