Integrating with Gravity Forms

I am building a Gravity form and want a form selector to be populated with events of a specific category – in the future.

The code below will return 5 events in the gravity form drop down but I need to try and filter them somehow.

$posts = get_posts( ‘numberposts=5&post_type=event’ );

I have tried all different things here but to no avail!

add_filter('gform_pre_render_1', 'get_events');
add_filter('gform_pre_validation_1', 'get_events');
add_filter('gform_pre_submission_filter_1', 'get_events');
add_filter('gform_admin_pre_render_1', 'get_events');
function get_events( $form ) {

   foreach ( $form['fields'] as &$field ) {

       if ( $field['type'] == 'select' ) {
         

       $posts = get_posts( 'numberposts=5&post_type=event' );

      $choices = array();

       foreach ( $posts as $post ) {
          
            $choices[] = array( 'text' => $post->post_title, 'value' => $post->id);
		   
        }

       $field['placeholder'] = 'Select an event';
        $field['choices'] = $choices;
    
	
	}

    }

   return $form;

}