In a bustling port where colorful canals wind between lively markets, siblings Sela and Thom uncover a painted journal filled with blank festival pages. Guided by its first entry, they're swept into the Day of Dancing Masks parade, meeting Maro, the mask-maker whose creations carry echoes of past celebrations. Each page transports them to lantern ceremonies by the river, harvest moon feasts in golden orchards, snowy mountaintop rites, and more. After each festival, its page vanishes, inspiring Sela and Thom to preserve every song, dance, and recipe by writing, sketching, and music. Their adventure shows traditions stay alive when shared.