Summer solstice represents culture, productivity, prosperity, good spirits, good health and more..!
In earlier times, in ancient China, ancient Europe and America, summer solstice was a cultural event. Rituals were performed to signify the power of the day. To get most out of the day, they performed prayers, called good spirits to help them, to bring them good luck, prosperity for the rest of the year, for good health and many more.
Today in many countries this day is celebrated as if it is embedded in their culture. Though the way of celebration is somewhat new but it signifies the importance of the festival.