EE set the calendar to show a specific date - this goes in the espresso-celendar.php file approx line 860. Note that month starts at 0 (zero) not 1, so code below is showing 21st March 2013

EE set calendar date

//this is just showing you where the code needs to go


                if( ee_parentHeight < ee_newHeight ) {
									ee_newHeight = ee_newHeight + 30;
									dayCnt.parents('tr').height( ee_newHeight ).css({ 'height' : ee_newHeight + 'px' });
								}
							
							}
						});

					},
					ee_imgTimeout
				);

// this is the actual code that changes the date
$('#espresso_calendar').fullCalendar('gotoDate', 2013, 2, 21);

			});