For the custumise to the event calendar,override template system ,
Be carefull for path of template below:
Customizing Template Files
Now currently the event calendar of single event page is not apply for the elementor .The case to use elementor ,think to use athor plugin system of event calendar.
👋 Please note that it’s currently not possible to create templates for the single event page with the Elementor theme builder for now, but we are working on improving compatibility!