A society rules and bylaws book dedicated to two deceased members. Come back and add a list of names to that same list. After several years.

If I understand you, a society (club) has a book of bylaws that was previously dedicated in memory of two people, and now they want to add more people to the dedication? Sure they can do that, although there should be a defined process for deciding who the book is dedicated to. If the society does not have such a process already defined in their bylaws, then the board should pass a resolution authorizing the change.