The Summer Solstice officially occurred today at 5:04 hours UT, 1:04 a.m EDT, or if you are on the West Coast at 22:04 PDT. It is an important day on the calendar as it marks an important shift from spring to summer. Ancient times saw the day celebrated with all kinds of rituals to welcome summer. It is the day of the highest sun and the longest daylight hours, but not the hottest day as some used to believe. And it was the time when the growing season for most crops had reached a turning point. National Geographic has a good article here about the 2013 summer solstice.
Today most of us have forgotten the significance it had for our ancestors. Today it is marked as the shift towards a time for vacations, kids to play, and work to be done on homes needing repair. The rituals have changed but the season is a vital part of the year for those who grow our food. Perhaps we ought to be thanking them.