jquery fullcalendar send custom parameter and refresh calendar with JSON

Question

im trying to use the jquery fullcalendar. The event data comes from the server using JSON. My page has a dropdown element and the fullcalendar div.

What i need is to

Answer 1

I refresh this way after an ajax event adds an event using a modal for instance:

$('#cal').fullCalendar('removeEvents');
$('#cal').fullCalendar('addEventSource', "../calendar/json-events2.php")
$('#cal').fullCalendar('rerenderEvents');