I'm so very sorry for your loss, and sorry that your mom won't be there, in person, on your wedding day. I cannot imagine how you dealt with this the day before your planned DW! My heart goes out to you. My husband and I (second marriage for both of us) were married 3 years ago. His Mom had passed away a few years before. We honored her by having the small posy on her chair and mention "in memory of" in our wedding program. But the best thing we did was to remove a flower (each of us) from the flowers on the wedding/altar arch and walk to the water's edge, say a prayer for her, and threw the flower in the Bay. It was meaningful to us and to our guests. My niece sang "When You Say Nothing at All" by Alison Kraus as we did that. It was beautiful.