opening = otwarcie (nowego budynku, sklepu, itp.)

by the opening ceremony of

Source: http://mindblog.dericbownds.net/2008/08/brooks-on-status-rules-and-collectivism.html

otwarcie (nowego budynku, sklepu, itp.)

opening = otwarcie (nowego budynku, sklepu, itp.)

English sentence and Polish translation

They postponed the grand opening of the supermarket until Wednesday. = Oni odłożyli wielkie otwarcie supermarketu do środy.