Tens of thousands of music fans flocked to the Lollapalooza music festival in Berlin in soaring summer temperatures, the organizers said on Saturday evening. Some 50,000 visitors at the start of the two-day festival at the Olympic park, the organizers said. The highlight of the first evening was set to be a performance by summer hit rapper Shirin David. Fans braved the heat to dance in front of the seven stages starting in the afternoon. Many brought fans to cool themselves as the temperature rose above 30 degrees Celsius. Video screens displayed tips on how to best cope with the heat. The fes…