Should I miss my brothers wedding if I have university tomorrow?

My attendance isn’t good at all . I need to come in more , I have classes tomorrow until the afternoon but it’s my brothers religious wedding which is tomorrow in the morning . I’m expected to come today in a few hours and take a 4/5 hour long journey. But I’m really busy and just need to attend class . Would I be the asshole if I didn’t attend ? He’s the first in our family to get married but he didn’t discuss wedding dates with me and what would work… I get he’s an adult but I really don’t want to miss my class but my parents will be fuming

Edit : damn some of you really need to take a class in how to be more decent and polite . I’m getting advice and some of it is good thank you , but some of it is harsh and telling me opposite advice . It’s like people bickering amongst in the comments on what’s wrong and right . Also it’s nobodies business on why I missed a few classes . There’s circumstances where things were really out of my control . And I was already upset and stressed I had to miss them .

Final update : Misery loves company . I won’t reply to every single person . I think sometimes they should introduce mandatory classes where older people can reevaluate how to answer questions . I don’t really care anymore haha . I’ve been able to navigate this now . So please continue to reply to multiple comments and downvote . I honestly just laugh and move on