market day

market day (plural market days)

1. Used other than figuratively or idiomatically: see market,‎ day.
2. The day of the week in which a market is held in some particular location.
   • 1980, AA Book of British Villages, Drive Publications Ltd, page 60:

     On market days the farmers would come in before going home - Tysons and Lindsays and Birketts and Longmires and Boows and Dawsons - and their dogs would lie in heaps on the flags while they themselves supped Gerald's ale.