I went to Nif cherry festival last year and there were loads of huge cherries for sale. I thought that it was quiet for a festival until later in the evening when suddenly hundreds of people arrived to hear the music.The same thing seems to happen at most festivals, Turkish people arrive late in the evening, but then they are probably working during the day.
I think that the festivals enable you too meet Turkish people whom you would not normally come into contact with as a tourist. People who are farmers etc.