May - June:
Rocket Festivals
July 27th:
Khao Phansa Day - The Candle Festival
August 12th:
Queen Sirikit's Birthday - Mothers' Day

This is a Thai National Holiday to celebrate the birthday of Her Majesty Queen Sirikit. This days is also celebrated as Mothers' Day in Thailand.
Queen Sirikit was born Momrajawongse Sirikit Kitiyakara on August 12, 1932, at the home of Lord Vongsanuprabhand, her maternal grandfather. She is the eldest daughter and the third child of Mom Chao Nakkhatra Mangkala Kitiyakara, the son of Prince Kitiyakara Voraluksana, Prince of Chunthaburi and Mom Luang Bua Sanitvongse. Her name was given by King Prajadhipok. Her name means the Greatness of Kitiyakara.
Her Majesty the Queen has captured the hearts of the Thai people through her devotion to improving the welfare and well-being of her subjects. The Queen is perhaps best known for her efforts in reviving many of Thailand's folk arts and crafts. Her Majesty's SUPPORT Foundation (Foundation for the Promotion of Supplementary Occupations and Related Techniques) has expanded progressively since its establishment in 1976 to include craft shops in the city and popular tourist areas, and two Thai Folk Arts and Crafts Training Centers at Chitralada Villa and at Bangsai in Ayutthaya.