Simple jquery instructions attached on form is not executeing
jQuery 101: If you want to manipulate an element in the DOM, the DOM needs to be ready first.

(function ($) {
  $(function() {
    $('#field-ai-event-date-unique-add-more-wrapper').hide();
    $('#field-ai-event-date-range-add-more-wrapper').hide();
  });
})(jQuery);


See jQuery.ready().

If you can convince yourself never to forget this small fact, life will be a lot easier :)