Fullcalendar
Work In Progress
Unfortunatly, the treepl Default calendar is not compatable with IE11 (Forum Post). This is bad, and does not work for a number of clients. So I am seeking my own option.
Whilst im fine with the admin panel being ES6 restricted, that does not fly for front end sites imo.
Regarding the data: Treepl has an issue with their APIs, so data takes 20+ seconds to load. Due to be fixed Mid Oct in v4.9