How to call template when Custom form is submitted?
Please update your _menu function with this code.

  function filterevents_menu() {
  $items = array();

    $items['events-filter'] = array(
        'title' =&gt; 'Events Listing',
        'description' =&gt; '',
        'page callback' =&gt; drupal_get_form,
          'page arguments' =&gt; array('filterevents_form'), 
        'access callback' =&gt; TRUE,
    );
    return $items;
  }


And then clear drupal cache. Hope it will work.

Thanks.