Event Calendar Blog and Feed

// Add this to your theme's functions.php
function edit_my_query($query) {
  // Modify category and tag listings to include ai1ec events and all uses of the same term
  //  across event and post taxonomies
  //  ie live-music or arts whether they are event or post categories
  // also include ai1ec events in blog home and feeds
  if ( ( is_home() || is_feed() || is_category() || is_tag() )
          &&  empty( $query->query_vars['suppress_filters'] ) ) {
    // The 'suppress_filters' test above keeps your menus from breaking
    $post_type = get_query_var('post_type');
    if($post_type && $post_type[0] != 'post') {
      $post_type = $post_type;
    } else {
      $post_type = array('post','ai1ec_event'); // add custom post types here
    }
    $query->set('post_type',$post_type);
    if (is_category() || is_tag()) {
    // Add custom taxonomies to category and tag pages
    if (is_category()) {
        $taxonomy1 = 'category';
        $taxonomy2 = 'events_categories';
      }
      if (is_tag()){
        $taxonomy1 = 'post_tag';
        $taxonomy2 = 'events_tags';
      }
      $queried_object = $query->get_queried_object();
      $slug = $queried_object->slug;
      $query->set('tax_query', array(
        'relation' => 'OR',
        array(
          'taxonomy' => $taxonomy1,  'field' => 'slug', 'terms' => $slug
        ),
        array(
          'taxonomy' => $taxonomy2, 'field' => 'slug', 'terms' => $slug
        )
      ));
    }
  }
}
add_action('pre_get_posts', 'edit_my_query');