code: func (el *CallbackEventListener) RegReattachments(f PromotionReattachmentEventCallback) {
  	el.ids = append(el.ids, el.em.RegisterListener(func(data interface{}) {
  		f(data.(*promoter.PromotionReattachmentEvent))
  	}, promoter.EventReattachment))
  }
docs: // RegReattachments registers the given callback to execute on reattachments.