message: Updates the fair being used to art-paris-2019
diff: - (ARCellData *)jumpToFair
  {
  return [self tappableCellDataWithTitle:@"Fair" selection:^{
  - id viewController = [[ARFairComponentViewController alloc] initWithFairID:@"art-los-angeles-contemporary"];
  + id viewController = [[ARFairComponentViewController alloc] initWithFairID:@"art-paris-2019"];
  [self.navigationController pushViewController:viewController animated:YES];
  }];
  }
  