National Advent Calendar Day is observed worldwide on the first Wednesday of November, marking the beginning of the Christmas season. This day encourages people to purchase Advent calendars, which are popular tools for counting down the days to Christmas. The tradition of Advent calendars originated in 19th-century Germany, where they were used by Lutherans to mark the days of Advent, often featuring images of the nativity scene or Saint Nicholas. Modern Advent calendars can contain various gifts, including chocolates, toys, and even items for pets. The day was established in 2020 by Aldi, a German discount supermarket chain, to promote the sale of Advent calendars. Celebrating National Advent Calendar Day involves buying calendars for oneself, family, and friends, or even creating personalized calendars as thoughtful gifts.