World Happy First Day of Summer June 20, 2012 prev6 of 9next PETRAS MALUKAS / AFP / Getty ImagesPeople play with bubbles in Vilnius, Lithuania on May 28, 2012 during the "Burbuliatorius," which takes place every second Monday during the summer in more than 15 cities around the world. Share Read Later TIME takes a look at how people across the Northern Hemisphere are getting ready to greet the long, hot days ahead.