Add this to your theme's functions.php file. It will display the name of your Events Calendar template file.

get_template_name.php

add_action( 'wp_head', 'template_name' );
function template_name() {
  if ( class_exists( 'TribeEvents' ) ) {
		if ( tribe_is_month() && !is_tax() ) { // The Main Calendar Page
			$template = TribeEvents::getOption('tribeEventsTemplate');
			print_r( $template );
		}
	}
}