I added the smcCal/Coranto calendar as you suggested... not live yet, but you can see it here:
www.vass.ca/cgi/calendar/index.cgi
I have it all working beautifully, but for one puzzle: the creating popup HTML links. As you can see from the March 28 'Test' posting, I edited the index.cgi of smcCal to create a _blank window for the link. I want that window to be 400x200 instead, but when I edited the index.cgi to add some javascript, thinks went a little mad. The popup worked perfectly, but it also changed the page of the calendar. So both the calendar and the popup would show the contents of the link.
The "_blank" code works, it does create a new window, but it would be ideal if the window was limited in size. Anyone found a workaround for this in their travels?