Even if it is not a public holiday, be aware that many businesses in Europe will give employees the afternoon or the whole day as a holiday. For instance in Portugal, while Christmas Eve is not a national holiday, most companies give their employees the day or afternoon off to prepare and to be with their families, and many businesses will close earlier than normal.
Christmas Eve marks the culmination of the Advent period before Christmas that started on the fourth Sunday before Christmas Eve. Many churches will mark the end of Advent with midnight church services.
In Latin America, Christmas Eve marks the end of a nine-day period before Christmas, called ‘Las Posandas’ which represents the none months of labour for the Virgin Mary before she gave birth to Jesus.