fullcalendar with clickable popup on hover

check this example. http://jsfiddle.net/craga89/N78hs/

eventClick: function(data, event, view) {
            var content = '<h3>'+data.title+'</h3>' + 
                '<p><b>Start:</b> '+data.start+'<br />' + 
                (data.end && '<p><b>End:</b> '+data.end+'</p>' || '');

            tooltip.set({
                'content.text': content
            })
            .reposition(event).show(event);
        }

it works on click, not in hover, but you can adapt it to work in hover as well

Use Bootstrap tooltip plugin http://getbootstrap.com/javascript/#tooltips . And then inside eventRender callback write following:

 eventRender: function(event, element) {
      $(element).tooltip({title: event.title});             
  }

This will work