When is Derry Onam celebrations in 2018 ? School holidays 2017/2018 School term dates for pupils in Northern Ireland for 2017/2018 school year. Event Date Schools resume after summer holidays 1 September 2017 Halloween 30 October 2017 to 31 October 2017 Christmas and New Year 21 December 2017 to 1 January 2018 (inclusive) Mid-term 15 Read more about When is Derry Onam celebrations in 2018 ?[…]