Why concerts are usually done during night time and not during day time?

Why concerts are usually done during night time and not during day time?

Probably because they have to spend the day getting ready for the concert and most people are at work In the day

It is because at night, the land is cooler so, the sound is going down which make more noise. While in day, the breeze is cooler so, the sound is going up which makes less noise.