Tribe: Auto-publish a Community Event only if user is logged in

functions.php

//Add to functions.php of your active theme
add_filter( 'tribe_events_community_sanitize_submission', 'set_community_events_publication_status' );
function set_community_events_publication_status( $submission ) {
  // Escape, assuming default is set to 'draft' and 'allow anonymous submits'
  if ( ! is_user_logged_in() ) return $submission;

  $submission['post_status'] = 'publish';

  return $submission;
}