National Playing Card Collection Day is celebrated annually on October 17, encouraging enthusiasts to appreciate and share their playing card collections. This day highlights the artistic and cultural significance of playing cards, which are often seen as portable art galleries. Participants are invited to showcase their collections online using the hashtag #CardCollectionDay, engage with fellow collectors, and even start their own collections. The event promotes community connection and discovery within the playing card hobby, allowing collectors to trade cards and support artists behind unique deck designs. Founded by Alex Chin, the day also features the release of special limited edition decks, with proceeds benefiting the online playing card database Portfolio52.