I am using JQuery Full Calendar in my application, but I need slightly different view, that is - in month view don\'t show tasks, just color days which have events associate
http://webdesignandseo.net/jquery/datepicker/
You can actually do this in the normal jQuery DatePicker if you wanted that instead (go to March to see events and click for an alert). I don't know much about how the Full Calendar Plugin works but there might be something in the documentation that will help:
http://arshaw.com/fullcalendar/docs/