public function get_tickets_unavailable_message( $tickets ) {
			$availability_slug = $this->get_availability_slug_by_collection( $tickets );
			$message           = null;
			$post_type = get_post_type();

			if ( 'tribe_events' == $post_type && function_exists( 'tribe_is_past_event' ) && tribe_is_past_event() ) {
				$events_label_singular_lowercase = tribe_get_event_label_singular_lowercase();
				$message = sprintf( esc_html__( 'Tickets are not available as this %s has passed.', 'event-tickets' ), $events_label_singular_lowercase );
			} elseif ( 'availability-future' === $availability_slug ) {
				/**
				 * Allows inclusion of ticket start sale date in unavailability message
				 *
				 * @since  4.7.6
				 *
				 * @param  bool	$display_date
				 */
				$display_date = apply_filters( 'tribe_tickets_unvailable_message_date', $display_date = true );

				/**
				 * Allows inclusion of ticket start sale time in unavailability message
				 *
				 * @since  4.7.6
				 *
				 * @param  bool	$display_time
				 */
				$display_time = apply_filters( 'tribe_tickets_unvailable_message_time', $display_time = false );

				// build message
				if ( $display_date ) {
					$start_sale_date = '';
					$start_sale_time = '';

					foreach ( $tickets as $ticket ) {
						// get the earliest start sale date
						if ( '' == $start_sale_date || $ticket->start_date < $start_sale_date ) {
							$start_sale_date = $ticket->start_date;
							$start_sale_time = $ticket->start_time;
						}
					}

					$date_format = tribe_get_date_format( true );
					$start_sale_date = Tribe__Date_Utils::reformat( $start_sale_date, $date_format );

					$message = __( 'Tickets will be available on ', 'event-tickets' );
					$message .= $start_sale_date;

					if ( $display_time ) {
						$time_format = tribe_get_time_format();
						$start_sale_time = Tribe__Date_Utils::reformat( $start_sale_time, $time_format );
						$message .= __( ' at ', 'event_tickets' ) . $start_sale_time;
					}
				} else {
					$message = __( 'Tickets are not yet available', 'event-tickets' );
				}
			} elseif ( 'availability-past' === $availability_slug ) {
				$message = __( 'Tickets are no longer available.', 'event-tickets' );
			} elseif ( 'availability-mixed' === $availability_slug ) {
				$message = __( 'There are no tickets available at this time.', 'event-tickets' );
			}

			/**
			 * Filters the unavailability message for a ticket collection
			 *
			 * @param string Unavailability message
			 * @param array Collection of tickets
			 */
			$message = apply_filters( 'event_tickets_unvailable_message', $message, $tickets );

			return $message;
		}