Not show button for private events

booknow.php

<?php
/**
 * @var mixed $data Custom data for the template.
 */
if ( $data->utilities->get_element( 'booknow', $data->args ) ) {
    // dont show button fpor private events
    if( get_post()->public === false ) {
        return;
    }
	switch ( $data->template ) {
		case 'divi':
			$button_markup = '<a class="submit et_pb_button %6$s" id="wfea-popup-booknow-%5$s" %1$s %3$s aria-label="%4$s">%2$s</a>';
			break;
		case 'enfold':
			$button_markup = '<a class="button" %6$s" id="wfea-popup-booknow-%5$s" %1$s %3$s aria-label="%4$s">%2$s</a>';
			break;
		default:
			$button_markup = '<a id="wfea-popup-booknow-%5$s" %1$s %3$s aria-label="%4$s" class="%6$s"><button>%2$s</button></a>';
	}
	?>
	<div class="<?php echo esc_attr($data->event->layout_class); ?>__booknow booknow eaw-booknow <?php echo $data->event->popup; ?>">
		<?php
		printf( $button_markup,
			$data->event->booknow,
			$data->event->cta->text,
			( $data->utilities->get_element( 'newtab', $data->args ) ) ? 'target="_blank"' : '',
			( empty( $data->utilities->get_element( 'aria_label_booknow', $data->args ) ) ) ? $data->event->cta->text . ' ' . __( 'on Eventbrite for', 'widget-for-eventbrite-api' ) . ' ' . esc_attr( get_the_title() ) : $data->utilities->get_element( 'aria_label_booknow', $data->args ),
			$data->unique_id . '-' . $data->events->post->ID,
			$data->event->cta->class
		);
		?>
	</div>
	<?php
}