AIO for expecting my girlfriend to drive us or compromise for the weekend?

My girlfriend and I are going to a festival this weekend. We went last year and had a good time. It was my first time at a festival so didn’t really know what to expect so we pretty much did what my gf chose since it was more her type of music etc but I really enjoyed the atmosphere and they had a lot of good food and drinks available. 

They had a large craft beer selection that you can’t get back home so it was nice to try new beers.

We didn’t camp, we drove in each day and stayed in a place my partners parents own that is nearby. My gf drove as I was drinking and she was just there for the music anyway so didn’t really want a drink. We planned to do the same this year. 

Last night my gf mentioned she thinks I should be driving this year instead. I reminded her we agree she would drive since I’ll be driving and she doesn’t want to drink whereas a big reason I’m going is to try new beers etc.

She just said she changed her mind and  it should be me driving. I suggests we camp so then we wouldn’t have to worry about driving or mentioned alternating who drives but she refused both suggestions Ans said it should just be me driving.

I disagreed and pointed out again that the drink choices are literally one of the reasons I’m going so I’m not going to go and just not have anything to drink.

She called me unfair but I pointed out it’s her being unfair because she knows my reasons for going aren’t the same as hers. 

AIO for expecting her to stick to what we agreed or at least compromise?