def METHOD_NAME(base_dir):
  """Find latest event file in `base_dir`.
  Args:
    base_dir: Base directory in which TF event flies are stored.
  Returns:
    File path, or `None` if none exists.
  """
  file_paths = glob.glob(os.path.join(base_dir, 'events.*'))
  return sorted(file_paths)[-1] if file_paths else None