Is it wrong to demand my parents to attend my convocation?

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So I am the eldest among 4 siblings in the family and I happen to be the only daughter as well. I will be graduating soon and my convocation will be a week before Christmas. I am currently studying abroad and I wish my parents would come for my convocation. My mum want to come but then my dad refuse to come. I thought that he can't leave work that is why he can't make it. Turned out that his vacation begin 2 days before my convocation and he still refuse to come. He wanted to celebrate xmas and new year in 2 diff places and a day after new year he's planning to go overseas, a country next to my current location. I am very upset and I told my mum that if he don't want to come, I'd rather don't go for the convocation. Besides, it's only a degree, anyway. everyone else can get it and it can happen to me like everyday *sarcastic mode*. Here's the thing. I will not push him to come if I know he can't afford it or can't leave work. Now he can and the only thing that stop him from doing so is I don't know what. I am very very upset and I've told my mum that I don't even want to go back for holiday if he can't make it. i know I will be very angry whenever I see him and I can't bear the feeling if I have to go back home and see him around, IF he still refuse to go to my convocation. I know it sounds utterly childish, but that's my wish. For my parents to be there on my convocation. I may not be an A+ students, but it's one of the biggest achievement in life. Guess what, I can imagine he will even refuse to attend my wedding. :) I don't really want to talk to him right now because I will just burst like a volcano. But yea, is it wrong for me to wish that he'll come and at least take a pic and share the moment of joy and happiness with me? I am deeply hurt. Thanks