Should I get married the day before my friends bday?

If that is the date that works for your and your partner, I would go with it. I don’t think you need to move your wedding date because it’s the day before your friend’s birthday.

If your friend has been planning a big blowout party with the same group of friends for a long time, I’d reconsider. But in normal circumstances, a wedding trumps a birthday. You have to coordinate a lot of different schedules, so do what works best for you and your fiance.

That is a conversation that you need to have with your friend. Only they know what their response will be. Some people don’t celebrate birthdays at all, even the milestone ones, and others make a big celebration around it for multiple days and don’t take kindly to anything getting in the way of it. There is no one size fits all answer.