The event celebrated on the summer solstice in many ancient cultures is the Summer Solstice. This occurs around June 21st and marks the longest day of the year. Various civilizations, including the Incas, Celts, and Native Americans, held rituals and festivities to honor the sun. Activities often included feasting, dancing, and ceremonial rites aimed at ensuring a good harvest and invoking blessings from nature, reflecting deep spiritual connections with solar cycles.