Display the Calendar in the opened state

It looks like you can use the show() function:
http://api.jqueryui.com/datepicker/

I added a datepicker to the page and then added this code to my theme's functions.php to include a small bit of jQuery to force the datepicker to shown when the page is loaded: http://pastebin.com/s6rDnwJ2

There are simpler ways to add the jQuery to the page, but above is how I did it. This is the code which forces the datepicker open:

[js]
jQuery(document).ready(function($) {
	$( "body .gform_wrapper input.datepicker" ).datepicker( "show" );
});

If you added it to the header of your page, it would look like this:

[js]
<script type="text/javascript">
jQuery(document).ready(function($) {
	$( "body .gform_wrapper input.datepicker" ).datepicker( "show" );
});
</script>