FullCalendar in WordPress is not working

You page is generating two errors: Uncaught TypeError: undefined is not a function.

This is likely due to the fact that WordPress sets jQuery to NoConflict mode. Your script is using the $ shortcut and is failing.

Modify your script accordingly, either replacing the shortcut or wrapping the jQuery.
https://codex.wordpress.org/Function_Reference/wp_enqueue_script#jQuery_noConflict_Wrappers

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