>Why do the calendar-based field-types not collect and display in the Wiki page Tracker form?
I don't know. I guess it has never been coded or it's broken.
>How can I make them collect and display properly?
I would try with TikiWiki 2.0, maybe it's been fixed. If not, please report a bug.
>How do I subsequently collect, compare, sort, and display the aggregated data from fields 14, 15, and 16 across all Item instances that contain the same value for the FID=14 "Name of Event or Meeting"? — regardless of what field-type I end up using for fields 14, 15, and 16?
"TRACKERLIST(trackerId=3, fields=>14:15:16:17:18:19, showtitle=y,filterfield=14,filtervalue="event A" )}
You could also use PluginTrackerFilter which would make drop downs for you.
This is an interesting use of trackers and a candidate for http://profiles.tikiwiki.org