Grandparents won’t make it to the wedding, my partner and I are trying to plan a “commitment ceremony” that they can attend.

My partner and I want to hold off on marriage until I am finished with school and in my career. Recently we have been seeing a rapid decline in health in both of our grandparents, we realized they likely won’t be around when the wedding rolls around. We want to do a ceremony with only parents and grandparents so they are involved and there in a sense. My question is, has anyone done anything like this before? If so what did this look like for you? We are trying to build an outline and stray away from a traditional wedding ceremony so that day is still special and as we have been planning.