Bridesmaid hair

I have long straight hair, it’s butt length and does not curl no matter what, it’s literally straight.

That being said, I do nothing with my hair I tie it back everyday without fail it is my bad habit. If I try to have it down, I go right back to tying it back away.

I am in a very laid back wedding on Sunday. I obviously want to look nice, but I am struggling with what to do with my hair. If I do it nice and have it down it will probably get up back again, just because I can’t deal with it.

What should I do? Would putting it back in a low bun be stupid?

Any other advise?