onTemplatesReady isn't running


For some reason, onTemplatesReady isn’t running. It should be and it used to.
You can see the system here: shul.co.uk/diary/admin/calendar.php

Could it be anything to do with me changing from dynamic database loading, to making it load all data initially?

This event does fire during scheduler.init
Now you are attaching event handler after scheduler.init, so it will not be triggered ( just move attachEvent command before scheduler.init )