The European countries have different systems for the school holidays. However, a lot of school holidays are in the same period, only vary in length and/or exact start- and end dates
Christmas & New year 2017 into 2018
England: 18/12/2017 to 05/01/2018
Scotland: 22/12/2017 to 07/01/2018
Ireland: 23/12/2017 to 07/01/2018
Wales: 23/12/2017 to 07/01/2018
Bulgaria: 23/12/2017 to 03/01/2018
Romania: 23/12/2017 to 07/01/2018
Russia: 02/01/2018 to 14/01/2018
Greece: 23/12/2017 to 05/01/2018
February half term 2018
England: 12/02/2018 to 23/02/2018
Scotland: 12/02/2018 to 20/02/2018
Ireland: 10/02/2018 to 18/02/2018
Wales: 12/02/2018 to 16/02/2018 Also some 19/02/2018 to 23/02/2018
Easter Holidays 2018
England: 26/03/2018 to 13/04/2018
Scotland: 03/04/2018 to 17/04/2018
Ireland: 26/03/2018 to 06/04/2018
Wales: 26/03/2018 to 06/04/2018 Also some 30/03/2018 to 13/04/2018