def get_event_suburb(event):
  """
  Returns the second to last comma-separated portion of a Proximity Events address, which basically
  appears to always be the suburb. eg. '20 Main Street, Box Hill, VIC'
  """
  event_address_parts = event['event_address']['S'].split(', ')
  return event_address_parts[len(event_address_parts) - 2]