Definition of tag day in English:

tag day

noun

North american
dated
  • A flag day.

    • ‘They were asked to organise fund-raisers and tag days (Pelletier-Baillargeon 585-87, 599-600).’
    • ‘Fundraisers include bake sales, tag days, garage sales and a ‘March of Loonies’.’
    • ‘Several car wash / tag days are scheduled for the spring of 2003.’