Christmas Eve marks the end of Advent and blends Christian roots with Czech traditions like carp scales under plates, apple cutting, and slipper tossing. Originating from solstice celebrations, Christmas evolved with 19th-century customs like tree decorating and modest gifting. Fried carp, now a staple, became popular post-WWII. Most Czech stores close by noon, reopening Dec. 27, with exceptions for small shops, pharmacies, and gas stations.