Queries the server for calendar status information. May cause one or more CALENDAR_UPDATE_* events to fire depending on the contents of the player's calendar. In the default UI, called when the calendar is shown.
See also Calendar functions.
Signature:
OpenCalendar()
This function must query the remote server, and any results will not be immediately available to the game client. Please see the function's documentation for more information about how to retrieve any results.