How about a membership to a social club in their area? There are many exclusive clubs that offer unique experiences like cocktail-making classes or networking events. Another idea could be a personalized set of cocktail glasses or a bartending book to help them entertain guests at home. If they enjoy traveling, you could also consider a weekend getaway or a night's stay at a boutique hotel that has a social club or bar onsite.
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.