What is the reason for attributing Lord Buddha's statues to days the of week?

[Image courtesy of ThaiSmile.jp](http://www.thaismile.jp/FotoGallary/ThaiPics/e_ThaiPhoto_MaeHongSon_WatChongKamChongKlang.html) Visiting Buddhist temples, I often notice several statues of Lord Buddha. As far as I understand, they represent different Boddhisattvas. However, these statues are often attributed to different days of the week. I tried to ask Buddhist people why this is so, and they have answered me that this is because each Boddhisattva has had some important event in their life (and in Lord Buddha's life as well), and that event has occurred on a corresponding day of week. But I still can not figure out why these events have never clashed and occurred precisely on different days of week. How can it be? In other words, why have two or more events **not** happened on the same day of the week? Can it be that such attribution only has metaphoric sense?