You should not miss out on your sons games if it’s important to you. I think it is perfectly fine to close an hour and a half early only one day a week for 6 weeks ( I forgot how long you said it would be for ) I would discuss it with the parents and most likely everyone would be fine with it. I would not charge less for the day either.
I try not to miss out on things because personally I would regret it. I have a very reliable assistant and an additional back up substitute. I line everything up in advance, so I am always open during my contracted hours.

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