My fiance's best friend and co-best man, "T", killed himself recently. We're getting married October 28 of this year. He was also dating my cousin, another wedding party member. T's sister is going to stand up in his memory, and my fiance's other best friend is now the sole best man instead of being a co-best man. We're really struggling with what to do at the reception. It's a Dr. Who/Audrey Hepburn theme wedding Halloween weekend, and the reception is a masquerade ball/costume party. T's parents and sis were on the guest list before all this happened, and all said that they would still be coming to our wedding. We don't want to bring the whole thing down, but it's going to be a really, really hard day for us, especially my fiance. It won't feel right not mentioning T or doing something to remember him at either the ceremony or reception. Any ideas would be appreciated. Thank you.
Edit:
My fiance and T were closer than twins. T's family welcomed my fiance into their house for almost 2 years when he had nowhere else to live, and they, T's family, consider my fiance to be their "other son". I considered T to be like a brother as well. We are definitely including his family in the decisions.
Excluding the kids invited, 87% of the guests knew T and at least 90% know what happened. If very few knew it would be different. I feel it will be really weird to have no mention when it will be such a big presence.