vt7 dev release - two copies of fullcalendar in the source
libraries/fullcalendar/fullcalendar.js is version 1.5.3 layouts/v7/lib/jquery/fullcalendar/fullcalendar.js is version 2.3.1
both are somewhat old, not sure if 1.5.3 is being used, it would be good to update to 3.1.0 (I think there would be things needing to be fixed, a straight drop in doesn't quite work)