set capabilities on registering the wp_meetup CPT

public_html/wp-content/plugins/wcpt/wcpt-meetup/meetup-loader.php

@@ -152,6 +152,19 @@ public function register_post_types() {
 					'show_ui'         => true,
 					'can_export'      => true,
 					'capability_type' => Meetup_Application::POST_TYPE,
+					'capabilities'          => array(
+						// `read` and `edit_posts` are intentionally allowed, so organizers can edit their own posts (but not others').
+						'create_posts'           => 'wordcamp_wrangle_meetups',
+						'delete_posts'           => 'wordcamp_wrangle_meetups',
+						'delete_others_posts'    => 'wordcamp_wrangle_meetups',
+						'delete_private_posts'   => 'wordcamp_wrangle_meetups',
+						'delete_published_posts' => 'wordcamp_wrangle_meetups',
+						'edit_others_posts'      => 'wordcamp_wrangle_meetups',
+						'edit_private_posts'     => 'wordcamp_wrangle_meetups',
+						'edit_published_posts'   => 'wordcamp_wrangle_meetups',
+						'publish_posts'          => 'wordcamp_wrangle_meetups',
+						'read_private_posts'     => 'wordcamp_wrangle_meetups',
+					),
 					'map_meta_cap'    => true,
 					'hierarchical'    => false,
 					'has_archive'     => false,