It’s a birthday celebration. The King’s month. People show their respect and loyalty.

Bhumibol Adulyadej (born Monday, December 5, 1927 in the Year of the Rabbit), is the current King of Thailand. Officially styled "the Great" (Thai: มหาราช, Maharaja), he is also known as Rama IX. Having reigned since June 9, 1946, he is the world's longest-serving current head of state and the longest-serving monarch in Thai history.
A billionaire and one of the wealthiest men in the world, Bhumibol used part of his great wealth to fund development projects, particularly in rural areas. He is immensely popular in Thailand, and is revered as a semi-divine figure by many Thais. Critics, mostly outside Thailand, attribute this status to the suppression of criticism of the monarchy.
Bhumibol was born in the United States and educated primarily in Switzerland. Bhumibol is also an accomplished musician, artist, and sailor.(www.wikipedia.org)

Long live the King!!!