Only showing taxonomy related to filtered nodes

I have been hacking away at event code to
A- not show taxonomy for 'solo' nodes when presenting nodes labeled as 'all'. This was easily done. It is useful because if you make a node not visible in the (all) calendar view (i.e. 'solo' node), why would you want to see the taxonomy for that node? - No problem.

B- only show the taxonomic terms related to the taxonomy (AKA category) used for the selected type (AKA node) view. - Serious difficulties
I am trying to use $curtype to get the currently displayed node name and then grab its taxonomy (unless all is selected of course). This may not be the right approach. Any help would be appreciated.

/**
* Returns a dropdown event taxonomy term input control.
*
* @ingroup event_support.
* @param $curterm The current term id.
* @param $submit Adds 'onChange' form submit javascript command to control.
* @return A form with a dropdown event taxonomy term input control.
*/
function _event_get_taxonomy_control($curterm = NULL, $autosubmit = TRUE) {
  if (module_exist('taxonomy')) {
    $types = event_get_types();
    $vs = array();
      if ($curtype == 'all')  {
        foreach ($types['all'] as $type) {
          $results = taxonomy_get_vocabularies($type);
          foreach ($results as $vocab) {
            $vs[$vocab->vid] = $vocab;
          }
        }
        $results = null;

        $items['all'] = t('(all)');
        foreach ($vs as $vid => $vocab) {
          $tree = taxonomy_get_tree($vid);
          foreach ($tree as $term) {
            $items[$term->tid] = $vocab->name.' - '.$term->name;
          }
        }
      }
      else  { 
        $results = taxonomy_get_vocabularies($curtype);
        foreach ($results as $vocab) {
          $vs[$vocab->vid] = $vocab;
        }

        $results = null;

        $items['all'] = t('(all)');
        foreach ($vs as $vid => $vocab) {
          $tree = taxonomy_get_tree($vid);
          foreach ($tree as $term) {
            $items[$term->tid] = $vocab->name.' - '.$term->name;
          }
        }
      } 
    

    $form['event_term_select'] = array(
      '#type' => 'select',
      '#default_value' => $curterm,
      '#options' => $items,
      '#description' => t('Select event terms to filter by'));
    if ($autosubmit) {
      $form['event_term_select']['#attributes'] = array('onChange'=>'this.form.submit()');
    }

    $form = drupal_get_form('event_taxonomy_filter', $form);

    return theme('event_filter_control', $form);
  }
}

/**
* Returns a dropdown event-enabled content type input control.
*
* @ingroup event_support.
* @param $tid The current term id.