jojaba

Still works for me. Can you give me the source of the page where you display the calendar ?
The code snippet must be added after the jQuery call, is this the case for you?
Oh and what I get in the code is the h2 title of the day, so if you want to have all infos, just replace this:
qt_content = source_td.find('.gce-event-info h2');
By this:
qt_content = source_td.find('.gce-event-info');

It depends on where you display the calendar.
If you display it in a post or as a single page, you can put this code at the end of the single.php file or the footer.php file of your theme.
For single.php add this code:

<script>
/* Adding title to each day (td) for calendar */
var get_title_func = function() {
    jQuery("td.gce-has-events").each(function(){
      // Finding infos content
        var source_td = jQuery(this);
      var qt_content = source_td.find('.gce-event-info h2');
        // if multiple events on one day we have to loop
        qt_content.each(function() {
            var c = jQuery(this).html()
            source_td.append('<div style="font-size: 0.8em; margin: 10px; padding: 2px 5px; border-radius: 4px; background: #FFF">' + c + '</div>');
        });
    });
}
// Launch function after window load and after ajax request
jQuery(window).load(get_title_func);
jQuery(document).ajaxSuccess(get_title_func);
</script>

If you choose to add it to the footer.php file:

<?php if(is_single()) : ?>
<script>
/* Adding title to each day (td) for calendar */
var get_title_func = function() {
    jQuery("td.gce-has-events").each(function(){
      // Finding infos content
        var source_td = jQuery(this);
      var qt_content = source_td.find('.gce-event-info h2');
        // if multiple events on one day we have to loop
        qt_content.each(function() {
            var c = jQuery(this).html()
            source_td.append('<div style="font-size: 0.8em; margin: 10px; padding: 2px 5px; border-radius: 4px; background: #FFF">' + c + '</div>');
        });
    });
}
// Launch function after window load and after ajax request
jQuery(window).load(get_title_func);
jQuery(document).ajaxSuccess(get_title_func);
</script>
<?php endif; ?>

You can also put it into your function.php file, probably the best way to do it…

Thanks filtah.
I guess my code works on grid calendar and yours in the widget…