Holy Ramadan is coming to all Muslim community. It starts at 21. August 2009 and ends at 22. September of 2009.
These days are best days for visiting istanbul. Sultanahmet is like open air food bazaar you can find everything inside that bazaar and cheap. Day time noone eats anything but evening time all people are in Sultanahmet having fun.
My point is if you want to visit istanbul come to istanbul in ramadan and live the real holy spirit of ramadan see people how connected to each other and see how rich peoples helps to poor ones.