In Bulgaria, Christmas (Bulgarian: Коледа, Koleda or more formally Рождество Христово, Rozhdestvo Hristovo, “Nativity of Jesus”) is celebrated on 25 December (unlike in some other Eastern Orthodox countries) and is preceded by Christmas Eve (Бъдни вечер, Badni vecher).

Traditionally, Christmas Eve would be the climax of the Nativity Fast, and thus only an odd number of lenten dishes are presented on that evening. On Christmas, however, meat dishes are already allowed and are typically served.

Among the Bulgarian Christmas traditions is koleduvane, which involves boy carolers (коледари, koledari) visiting the neighbouring houses starting at midnight on Christmas Eve, wishing health, wealth and happiness and patting the backs of the people with decorated cornel sticks (сур(о)вачка, sur(o)vachka). Another custom is the baking of a traditional round loaf (пита, pita).

As in other countries, a Christmas tree is typically set up and the entire house is decorated. The local name of Santa Claus is Dyado Koleda (Дядо Коледа, “Grandfather Christmas”), with Dyado Mraz (Дядо Мраз, “Grandfather Frost”) being a similar Russian-imported character lacking the Christian connotations and thus popular during the Communist rule. However, it has been largely forgotten after 1989, when Dyado Koleda again returned as the more popular figure.

Source: Wikipedia