I like the general direction this is heading. But, like Jaffa the cake, have trouble with "offensive slide decks will not be tolerated". (I'm thinking here of my slidedeck "You too can be a bedwetting antfucker" the title of which was suggested by the organisers of a conference).
What you mean is no slides that a normal, sane, liberal person could find seriously offensive.
Just a side-thought - so maybe nonsense - do you want to say " please report all incidents" and make it a bit classroom? How about "If you hear incidents of racism/ sexism/ being a dick, please call out the person, either personally or social media". Make it a self-policing community ?