Midsummer is a special time when the sun stays up for a really long time and it's very bright outside. It happens because the Earth is tilted on its side, like a toy top that's leaning over. During midsummer, the part of the Earth where you live is tilted more toward the sun than any other time of the year. This makes the days really long and the nights really short.
In some countries, people celebrate midsummer by dancing around a special pole with flowers and ribbons, singing songs, and having big feasts with lots of foods like strawberries, cream, and fish. It's a happy time when everyone gets together and has fun outdoors. Some people think that midsummer is magical and that if they go out in the woods at night, they might see fairies or other magical creatures.
Midsummer is usually around June 20th or 21st in the Northern Hemisphere, and around December 21st or 22nd in the Southern Hemisphere. It's a great time to be outside and enjoy the sunshine!