This idea is inspired by the tradition of having a special birthday plate that is only used on birthdays by the person whose birthday it is. In my version wrap a special plate, either one you already have or one that you make or buy just for this purpose. Then you have a family dinner and set an extra place at the table with this plate. During the meal you talk about the ancestor or family member that is the special guest for dinner. Someone could be ready with stories about you special guest or family members could share memories about that person, depending on the situation. You could even invite someone to come in costume as the ancestor and play the role for the night.
These special dinners could be held monthly or on or near the birthday of the ancestor or whatever works for your family. You could place card by the special plate with the guest of honors name and a photo would be a nice touch. If you know a favorite food of the guest, it would be fun to serve that as part of the meal. This is just a starting point. The same idea would work for living members of your family and use it as a way to honor the talents and accomplishments of the guest of honor.
If you Google custom plates there are tons of options of plates you can buy with a family name or other images. There are many ways to decorate a glass or ceramic plate yourself. Below are a few links to give you some ideas and get you started on this project.