Dialectic integrates with the Calendar application by allowing you to send the contents of the Notepad or of While You Were Out notes to the Calendar application as either new events or new ToDo items.
Further, you could use the Calendar application to remind you of important calls to be made with Dialectic and can even schedule the Calendar application to dial Dialectic at a specific date & time by running an AppleScript that tells Dialectic to dial or automatically change the Location based on the time of day to ensure calls are made by the most economical method possible.