Display the description of taxonomy terms

get_terms() returns an array of WP_Term objects. To get the description, with the usual filters applied, you can pass this object to term_description():

$terms = get_terms( array(
    'taxonomy' => 'organizer',
    'hide_empty' => false,
) );

if ( ! is_wp_error( $terms ) ) {
    foreach ( $terms as $term ) {
        echo term_description( $term );
    }
}