Do you mean you want that to show as the first day on the calendar? Or default to that day being selected?
If it's the 2nd, are you trying to show the details of the event? If so you will either need to duplicate the EventCalendar web part and extended it programmatically or you could set the detail view to show the first event (assuming you are using a repeater) and then some JavaScript to select that day in the calendar.
If this wasn't helpful, feel free to provide some more information to help clarify what you are looking to do.