Youth Pledge Day is observed in Indonesia every October 28, commemorating the significant 1928 Youth Pledge made by young Indonesian nationalists during the Second Youth Congress. This pledge declared three ideals: one motherland, one language, and one nation. The congress, held from October 26 to 28, 1928, marked a pivotal moment in Indonesia's history, culminating in the reading of the Youth Pledge and the introduction of "Indonesia Raya," which later became the national anthem. To celebrate this day, many Indonesians hang the red-and-white national flag outside their homes and sing the national anthem, honoring the spirit of unity and nationalism that the pledge represents.