make song choice configurable option

booking.admin.inc

@@ -565,6 +565,16 @@ function booking_admin() {
     ),
     '#default_value' => variable_get('booking_enable_roommate', 0)
   );
+  $form['regn_options']['booking_enable_songchoice'] = array(
+    '#type' => 'radios',
+    '#title' => t('Enable attendee to specify song choice?'),
+    '#description' => t('Select whether to include questions about song choice in the booking form.'),
+    '#options' => array(
+      0 => t('No'),
+      t('Yes')
+    ),
+    '#default_value' => variable_get('booking_enable_songchoice', 0)
+  );  
   $form['regn_options']['booking_enable_dietary'] = array(
     '#type' => 'radios',
     '#title' => t('Allow attendee to specify dietary requirements?'),

booking.regn_form.inc

@@ -911,13 +911,15 @@ function booking_form($node, &$form_state, $inserting = FALSE, $early_access_all
     '#default_value' => !empty($data->booking_random_facts) ? $data->booking_random_facts : ''
   );
 
-  $form['misc-areas']['booking_song_choice'] = array(
-    '#type' => 'textfield',
-    '#title' => t("Let us know if there's a song you'd love to sing during the week."),
-    '#maxlength' => 200,
-    '#required' => FALSE,
-    '#default_value' => !empty($data->booking_song_choice) ? $data->booking_song_choice : ''
-  );  
+  if (variable_get('booking_enable_songchoice', 0) == 1) {  
+    $form['misc-areas']['booking_song_choice'] = array(
+      '#type' => 'textfield',
+      '#title' => t("Let us know if there's a song you'd love to sing during the week."),
+      '#maxlength' => 200,
+      '#required' => FALSE,
+      '#default_value' => !empty($data->booking_song_choice) ? $data->booking_song_choice : ''
+    );
+  }
   
   if ($inserting == TRUE) {
     $form['submit'] = array(