Hi Nick, I have copied the site back to my dev machine and have found the culprit.
In my calendar I have start and end dates set to be the same time, which I have purposely set so i could do this in my javascript
if (start_date == end_date){end_date = "till late";}
I use my calendar as storage for my website and the description holds a json formatted string allowing me to store event posters and other relevant information. In my gce event builder, I have a div with a data attribute to put the json string.