来自php脚本JSON字符串的后台事件全日历

I'm trying to include a list of holidays as Background Events from a separate event source. "holidays.php" is one of my event sources. In month view, when I reach one of the holidays dates, there is no background event and my other events from different sources disappear! When I comment out "holidays.php" as an event source, there is no issues with other events. I'm guessing there's an issue with my json string? I'm trying to include a list of holidays as Bac