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With an Advent calendar, you open a surprise, tiny gift every day of December until Christmas. With Advent of Code, you open a surprise, tiny code puzzle every day of December until Christmas.

It's a pretty common thing to call something "Advent of x" or "x Advent calendar" nowadays, if it involves something happening once each day between 1st and 25th of December. For example: https://24ways.org/

More here: https://www.creativebloq.com/web-design/advent-calendars-des...

Look at https://adventofcode.com/2015 :) A lovely Christmas tree!