Why Can't the Schools in my area make sure that they do not do things on the same day?

I have three children and they all go to three different schools.  Overall this is not a bad thing but when the schools plan activities it makes it really difficult for the parent.  Why don't they make sure that the other school doesn't do the same thing on the same day so I don't have to disappointment one of my girls.  Would that be too much to ask? 

I found out this morning my youngest daughter's field day is on the same day my middle daughter is going on a field trip.  Now why would this happen?  Did they plan it?  I can't believe in two places at the same time.  I want to be but one of my girls will be at her school for field day while the other is on a field trip several cities away which I had already planned to go to.  So how do I break this to the youngest?  I have gone on several of her field trips and have not gone on a field with my 8 year old.   

I want to scream at the moment because I do not want to pick between the two. 

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