How about a gift certificate to a literary festival? You could research different festivals in your area or ones that he has talked about wanting to attend and surprise him with a gift certificate to one of them. Alternatively, you could find a book collection that includes various books by authors that he has seen or met at a festival. That way, he can read and remember the highlights from each festival he attended.
Or you can get him a star map with the date when he welcomed you in this world.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.