roots-clean-nav-css-filter-example.php

<?php

function custom_nav_menu_css_class($classes, $item) {
	if (get_post_type() == 'event') {
	    if ($item->title == 'Resources') {
	        $classes[] = 'current-menu-parent';
	    }
	    
	    if ($item->title == 'Events') {
	    	$classes[] = 'current-menu-parent';
	    }
	}
	
	if ((get_post_type() == 'post') && is_category('news')) {
	    if ($item->title == 'Resources') {
	        $classes[] = 'current-menu-parent';
	    }
	    
	    if ($item->title == 'News') {
	    	$classes[] = 'current-menu-parent';
	    }
	}	

	return $classes;
}

add_filter('nav_menu_css_class', 'custom_nav_menu_css_class', 10, 2);

?>