Editing WoW:API OpenCalendar

{{wowapi}} __NOTOC__
<!-- Describe the purpose of the function, exhausting detail can be saved for a later section -->
Requests calendar information from the server. Does not open the calendar frame.
<!-- List return values and arguments as well as function name, follow Blizzard usage convention for args -->
 OpenCalendar()

== Triggers events ==
<!-- If this function triggers an event, name it here. If not, remove the entire section. -->
* {{api|t=e|CALENDAR_UPDATE_EVENT_LIST}}, when your query has finished processing on the server and new calendar information is available.

== Details ==
<!-- Details not appropriate for the main description can go here. 
     REMOVE the section if you're just going to restate the intro line! -->
: If called during the loading process, (even at {{api|t=e|PLAYER_ENTERING_WORLD}}) the query will not return.