Definition of Show Sunday in English:

Show Sunday

noun

historical
  • 1Oxford University the Sunday before Commemoration Week, on the evening of which a parade was formerly held in the Broad Walk of Christ Church.

  • 2A Sunday on which artists open their studios to the public to display works of art before submitting them to an exhibition; especially an annual event of this kind taking place in London prior to the Royal Academy Summer Exhibition.

Origin

Early 19th century; earliest use found in Charles Westmacott (?1787–1868), journalist and blackmailer.