How about a robot-shaped cake topper for their wedding cake? Or a personalized robotic sculpture as a decorative piece for their home? If they are into DIY, you could also look into getting them a robotics kit or a subscription to a robotics magazine where they can learn and build their own robots. Another option could be to get them tickets to a robotics convention or workshop as a fun and educational experience.
Or you can get her/him a star map with the date of the wedding.
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.