H.M. Queen’s Birthday is celebrated on June 3 in Thailand to honor Queen Suthida. This day is a public holiday, during which schools and most businesses close to allow citizens to participate in the festivities. The celebrations are particularly vibrant on Ratchadamnoen Avenue in Bangkok and near the king’s palace, where people wave the national flag and display portraits of the queen. Participants often wear purple, the queen's designated color, and buildings are adorned with purple and yellow decorations. The day features colored lights and flowers, creating a festive atmosphere throughout the city.