Even if you've never heard the word mensiversary, you're probably familiar with the concept. Combining the Latin words for month, "mensis," and turning, "versary," a mensiversary is the 30-day version of an anniversary.
I added the word to my vocabulary recently when a friend told me how she and her boyfriend celebrate each month spent together, explaining: "We mostly just say 'Happy Mensiversary!' and go grab dinner somewhere."
Even if it's as simple as that, do you mark the beginning of your relationship each month?