Create a drop down list that pulls a custom post type such as events in Ninja Forms

dropdown_by_post_type_in_ninja_forms.php

add_filter( 'ninja_forms_render_default_value', 'nf_hidden_field_values', 10, 3 );
// Populate event names for dropdown
add_filter( 'ninja_forms_render_options', function($options,$field_settings){
   if( $field_settings['key'] == 'event_names' ) {
       $args = array(
           'post_type' => 'event',
           'posts_per_page' => -1,
           'post_status' => 'publish'
       );
       $the_query = new WP_Query( $args ); 
       if ( $the_query->have_posts() ){
           global $post;
           while ( $the_query->have_posts() ){
               $the_query->the_post();
               $options[] = array('label' => get_the_title( ), 'value' => get_the_title( ));
           }
           wp_reset_postdata(); 
       }
   }
   return $options;
},10,2);