=?iso-8859-1?Q?Max_M=F8ller_Rasmussen?= writes:

Zope can easily do most all of the things you mention in zClasses. The most difficult items you are requesting though is calendaring and discussion. I looked at SquishDot, at it seems not to be bad for discussions (a la bulletin board). Calender generation is facilitated by the "Calendar" tag.

Dieter