Ciao wandaground,
Questo esempio apre "il calendario" al click su di un link.
codice:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Calendario</title>
<style type="text/css">
#calendar{
 display:none;
}
</style>
<script type="text/javascript" src="lib/jquery-1.10.1.min.js"></script>
<script type="text/javascript" src="source/jquery.fancybox.js?v=2.1.5"></script>
<link rel="stylesheet" type="text/css" href="source/jquery.fancybox.css?v=2.1.5" media="screen" />
<script type="text/javascript">
$(function(){
 $('#openCalendar').fancybox();
});
</script>
</head>
<body>
<a href="#calendar" id="openCalendar">Apri calendario</a>
<div id="calendar">
 <h3>Calendario</h3>
   <p>Qui ci va l'HTML del tuo calendario</p>
</div>
</body>
</html>
Puoi scaricare i file inclusi qui:
https://codeload.github.com/fancyapp...acy.zip/v2.1.5

Luca