officials say public meantime first responders are warning you stay hhydrated. take aaook from chopper 6. here is sort of the perspective from above. so many people. thousands and thousands of people h he ready to party and have a good time for that annual music festival everyone knows all about. the ultra music festival in full force in downtown miami. >> a nice party from all over the world. people come here. >> reporter: those into the electronic dance music scene will tell you miami is the place to be at this time of year. d.j. justin o. just got off stage. >> you look at people and how crazy they are and how much fun they're having. i think it is one of the best places to play in the world. >> reporter: he is here all the way from south korea and plans on staying longer. >> i think i'm going to delay my acts. >> reporter: for miami, ultra means a lot of tourists. >> hectic and crazy. >> reporter: it takes a lot of money to put on this event. >> it costs tens of millions of dollars to put this on. >> reporter: and 165,000 people are expected over the next fe