$(document).ready(function() {
  $("#member_gala_dinner").change(function() {
    toggle_dinner_details($(this));
    
  });
  toggle_dinner_details($("#member_gala_dinner"));
});

function toggle_dinner_details(checkbox) {
  var container = checkbox.parent().parent().parent().parent();
  
  if (checkbox[0].checked) {
    container.next().show();
    container.next().next().show();
    container.next().next().next().show();
    container.next().next().next().next().show();
    container.next().next().next().next().next().show();
    container.next().next().next().next().next().next().show();
  } else {
    container.next().hide();
    container.next().next().hide();
    container.next().next().next().hide();
    container.next().next().next().next().hide();
    container.next().next().next().next().next().hide();
    container.next().next().next().next().next().next().hide();
  }
}