Day 12 August date of birth date and therefore Thai manage 12 of August of every year as the holidays so that people who live outside the province or far from the mother has returned to find the mother to show love, and so on.
On 12 August, the day of Thailand's royal birth. Thus, on 12 August every year. Be a public holiday to allow people to stay away from the mother country or to return to the parent to show love and more.
The 12 August is the Thai knees. So the 12 every August. Day off, so that people live in the countryside or far from the mother back to mother to show love, and so on.