Dubai has formed Falcon and Associates to lead its bid for the 2020 Olympic Games, and will now have to prove that it can host the Greatest Show on Earth, or at least do a better job than rivals believed to include Cape Town, Delhi, Doha and Kuala Lumpur. One immediate problem for both Doha and Dubai is the hot summer weather. To overcome this is not a matter of air-conditioning but timing: the games will need to be shifted back to the autumn. This is not unprecedented but it has not been done i