An advent calendar is a European tradition that counts down the days to Christmas in December. The German version classically has 24 “doors”, since per German tradition presents are usually exchanged on the evening of Dec 24th.
I posted a Shea themed 24-day advent calendar style countdown on Twitter and Instagram in December 2021, leading up to Christmas with a new Shaun and Lea photo every day. You can see the full range of calendar images here, now that they’ve all been revealed.