Thai Name: วันพระบาทสมเด็จพระพุทธยอดฟ้าจุฬาโลกมหาราชและวันที่ระลึกมหาจักรีบรมราชวงศ์
Date: Saturday 6th April 2019 (Monday 8th April 2019 is a public holiday)
Venue: Temple of the Emerald Buddha and King Rama I statue at the Memorial Bridge
Chakri Memorial Day is observed on 6th April to commemorate the contribution of the kings of Chakri dynasty, who have been ruling Thailand since 1782. The day is a medium for the faithful people of Thailand to express their love and reverence to the kings.
On this day, the people of Thailand perform meritorious acts for the great kings of the ruling dynasty. People are led in ceremonies by King Maha Vajiralongkorn Bodindradebayavarangkun, who is the tenth king of the dynasty. The King, accompanied by members of the royal family, presides over the religious ceremonies held at the royal chapel in the Temple of the Emerald Buddha. He pays respects to his predecessors at the Royal Pantheon and proceeds for laying wreath at the statue of King Rama I at the Memorial Bridge. All government officials including the prime minister take part with the King in the wreath-laying ceremony.
Present Chakri dynasty of Thailand was founded by Phra Buddha Yodfa Chulaloke or King Rama I, who came to the throne on 6th April 1782. During his reign of 28 years, he consolidated the kingdom and established Bangkok as its capital. He died on 7th September 1809 at the age of 72.
Article source: http://www.thaifestivalblogs.com/chakri-memorial-day/