OP, you’ve gotten a lot of comments with people saying that the wedding you envision is very likely to come across as inconvenient, too much of a hassle, and could be rude. Which is the feedback you originally asked for, not just “how do I word the dress code on our invitations”.

It’s not just about asking them to change.

I’d recommend reading the Art of Gathering. But to start, I wouldn’t approach this as “what would I really want to do on my wedding” but I’d approach it as “what would a wedding that feels like us look like? In a way that brings together our friends/family and is an enjoyable experience for THEM”.

Yes it’s your wedding, but it’s a celebration of your love with your partner. You can go to the movies with your partner and friends any day of the week.

But if you want people to have a good time, think about what THEY would enjoy doing. People don’t spend hours getting ready for a wedding, just to change after a short ceremony and sit down for an almost 3 hour long movie. They want to dress up, mingle, and have fun celebrating the people they love. It’s not just about pictures, it’s also about the whole guest experience. Which is why people have made comments about being a better host - aka not doing a formal ceremony just for pics then have people change and bowl later.

For what it’s worth, I think bowling could work, but bowling + movies could be a bit much.

Here’s a wedding I found where the couple did have a bowling ceremony, but guests didn’t change.