Thanks for this wonderful plugin you made! Exactly what i was looking for!
I searched the forum and docs for info, but without luck. Hope you can tell me how.
I’m not sure why you would want to actually embed it in the template, as opposed to just using the shortcode for it. You can always use the shortcode to embed a calendar anywhere that you can put a shortcode (usually in the content section of a page or post).
If you did want to call it from within a template, you could just use the WordPress PHP do_shortcode function: https://developer.wordpress.org/reference/functions/do_shortcode/
Not that I haven’t tested it by calling it from within a template, but it should work as long as the current user has been established before the template is loaded.