Definition of tag day in US English:

tag day

noun

North American
dated
  • A day on which money is collected for a charity in the street and donors are given tags to show that they have contributed.

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

Pronunciation

tag day

/ˈtaɡ ˌdā/