You are missing a comma to separate the array elements:
var holidayObj = [{
"holidayName": "Boxing Day",
"holidayStart": "May, 26 Oct 2014 13:00:00 EST",
"holidayEnd": "May, 26 Oct 2014 13:00:00 EST"
}, {
"holidayName": "Some other Day",
"holidayStart": "May, 23 Oct 2014 13:00:00 EST",
"holidayEnd": "May, 23 Oct 2014 13:00:00 EST"
}];
By fixing it, it works fine (see the events in October).