Inserts the event calendar. There can only be one calendar on each page, since it has a unique XHTML id.
Note however that the one instance of “Get Calendar” can show ANY number of months by setting the “Number of Months” option in the Event Calendar settings page under Settings in Wp-Admin.
This “number of months” works for the sidebar calendar widget, calendars embedded in pages, AND the “Big Calendar” modification.
BUT — you only get ONE of those. Big Calendar (if you have that mod) OR embedded OR sidebar. The system simply IGNORES multiple calls to get-calendar automatically.
(Fixing that is on the to-do list.)