My ex waits until last minute every time

Ok so this is the second time this year he has done this. He is supposed to have our d for labor day. Sorry but I forgot. Honestly I don't think it's my job to keep track of his schedule. I already made plans for her to go to my mom's Sunday night and spend the night and then have a birthday party for me and my brother at my mom's on Monday. He just emailed now and said he wants her from Sunday night to Monday night. WTF? I'm so sick of him. I just feel like saying if you don't make plans a week in advance I assume you don't want her. What do you think?

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