How about tickets to see Wicked on Broadway or a local production? You could make a whole night out of it, including dinner and maybe even dressing up for the occasion. Another idea is to get her a special edition or signed copy of the Wicked book, along with some Wicked-themed merchandise like a t-shirt or poster. If she loves musicals in general, you could also consider getting her some other Broadway show soundtracks or tickets to a few shows throughout the year.
Or you can get her a star map with the date of your anniversary.
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.