What should I wear to a graduation ceremony? As a guest?

Anonymous
So my step sister is graduating from college this summer, and I'd like some ideas for what to wear for a graduation ceremony (I've never really been for one) so I think I'm supposed to wear something formal and summery?!
Could you post some pictures of ideas please?
I only own like short dresses I wear for night outs, so if there's any type of dress that would be appropriate for this, it could help if you'd post them here. Thanks
What should I wear to a graduation ceremony? As a guest?
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