Day Date Month Holiday Monday 2 Jan Substitution for New Year's Eve and New Year's Day Tuesday 3 Jan Special Holiday Monday 13 Feb Substitution for Makha Bucha Day Thursday 06 Apr Chakri Memorial Day Thursday 13 Apr Songkran Festival Friday 14 Apr Songkran Festival Wednesday 10 May Wisakha Bucha Day Friday 12 May Royal Ploughing Ceremony Day Monday 10 Jul Substitution for Asarnha Bucha Day Friday 28 Jul H.M. the King's Birthday Monday 14 Aug Substitution for Mother's Day Friday 13 Oct The Passing of His Majesty the Late King Bhumibol Adulyadej(Rama IX) Monday 23 Oct Chulalongkorn Day Thursday 26 Oct Special Holiday Tuesday 05 Dec H.M. the Late King Bhumibol Adulyadej's Birthday, National Day and National Father’s Day Monday 11 Dec Substitution for Constitution Day Remark: Subject to Change According to the Cabinet.