Grandmother's Corsage

You can always have the flowers preserved. There are many different ways you can do this to have them as a keepsake. As for the actual wedding, are you going to have a memorial table? If so, you could display them there.

We have a small arrangement on our memorial table, you could put the corsage by a picture of her?

If you'll have a small clutch purse, perhaps you could pin it to your purse as a way to "keep her near you" all day. Personally, I'm not a big fan of memorial tables & empty chairs (especially with her passing so recent, that could be too much for you and others who loved her). We did more subtle things. Daughter's bouquet was wrapped with fabric from her gramma's wedding dress and a penny from the year G-ma and papa were married was tied to her bouquet. She said it made her feel like they were holding her hand all day.... Condolences on the loss of your sweet grandmother.

Could you possibly incorporate her corsage into your bouquet? I'm so sorry for your loss

I came to say what other pps said, however I like this even better, so I'll just second this kind of idea. Seeing an empty chair might make you sad, but being able to touch and hold her corsage would bring comfort I think