I am using the jQuery FullCalendar (http://arshaw.com/fullcalendar/docs/).
I want to add some custom HTML to each day-cell.
For example in my case I want to have different background colors based on some logic, display a price in the middle…

Is there a way to customize the rendering of a cell?
I will explain how I solved this issue for other people.
I used the eventAfterRender callback. In there I used jQuery to parse the “element” parameter and re-write the html before it is sent to the browser.