Add Caldav Support to PHP calendar or replace calendar with Agendav by shanialleyne

Currently have a web application written in PHP using WDcalendar as the calendar component. Either need the current calendar to have caldav support added with something like sabredav etc or replace the current calendar with agendav… (Budget: $250-$750 CAD, Jobs: AJAX, Anything Goes, jQuery / Prototype, PHP, Software Architecture)