@svenn36 you don’t have to customize a theme inside the plugin folder.
It will always be overwritten by upgrades.
You should follow this Documentation to create your theme: https://time.ly/resources/additional-wordpress-settings/advanced-settings-for-your-timely-wordpress-calendar/create-new-calendar-theme/
in a few words, you need to:
– create the wp-content/ai1ec-themes/YOUR-THEME
folder
– copy one of the calendar default themes (es: vortex) style.css
file inside that folder
– change the first lines in the style.css (you need to change at least Theme Name)
– then copy any file you want to customize from the default theme to your new theme folder, maintaining the same folder structure. (don’t need to copy then whole theme, just the files you want to customize)
– then in events->calendar themes, activate your theme.