title: Allow the user to add only one event per day over FullCalendar
body: <p>I am using <a href="http://arshaw.com/fullcalendar/" rel="nofollow">FullCalendar</a>
  Is there any way that ban the user to enter another event to the same day if s/he already added an event to that day before ?</p>
  
  <p>So,If the use enters an event on a day,1-1-2012.
  If s/he clicks that day again,it will ban the user to enter a new event.
  I have an array of objects which contain the events the user enters.
  I am thinking now to filter this array and accordingly re-act when the user fires the select event.
  Am I on the right track !!
  Do you know other way to optimize that !!</p>