normal blog categories – Events Manager

// Use 'normal' Blog Categories in Events Manager
	function em_customcode_use_blog_categories(){
		$supported_array = (EM_MS_GLOBAL && !is_main_site()) ? array():array(EM_POST_TYPE_EVENT,'event-recurring');
		register_taxonomy_for_object_type('category',EM_POST_TYPE_EVENT);
	}
	add_action('init','em_customcode_use_blog_categories',100);


// Rename 'normal' Blog Categories, so the difference is clear between Events Categories on the main blog.

	function em_customcode_rename_blog_categories() {
		global $submenu;
		$submenu['edit.php'][15][0] = __('Blog Categories', 'your_textdomain'); 
		// You  need to customize the Label and textdomain
	}
	add_action( 'init', 'em_customcode_rename_blog_categories' );


// Create #_ccBlogCategory Placeholder

add_filter('em_event_output_placeholder', 'cc_output_blog_category', 1,3) ;
function cc_output_blog_category($replacement, $EM_Event, $result) {
	if ($result == '#_ccBlogCategory') {
		global $EM_Event;
		foreach ( (get_the_category()) as $category );
		$replacement = $category->cat_name;
	}
	return $replacement; 
}


//ref: https://wp-events-plugin.com/documentation/