You might remember your first trip together quite clearly: where you stayed, the photo you took, the place you would like to visit again. Ask for the exact date, though, and you may need to check your phone.

That doesn't stop you from wanting to remember it. A wedding anniversary gives you a particular day to celebrate each year. Other moments can be worth returning to even when you only remember the season.

Moving into a home together is one example. There may be several dates you could choose: when you collected the keys, carried in the furniture, or finally spent your first night there. You can decide which one feels right to you, or simply remember it as the summer you moved in.

Then there are the ordinary weekends. Perhaps you have a photo from an afternoon when everyone was home and nobody had anywhere to rush off to. You don't have to turn it into an annual occasion to keep it somewhere you can see it.

Choose a memory you both recognize

If you want to mark a shared moment, start by talking about it. Which part do you each remember? A first holiday might bring to mind a particular beach for one person and a long train journey for the other.

Looking through the photos together can help you choose something that means something to both of you. It also gives you a chance to write down details you still remember, such as the location or why you took the picture.

Leave room for more than a date

A keepsake can carry a place name, the year, or a few familiar words. “Our first home” may say exactly what you want it to say. If you can't confirm the day, there's no need to guess one just to fill a space in the design.

You could put the photo in an album with a short note, frame it for your desk, or have it made into a custom photo crystal. Choose an image you enjoy looking at and wording that feels familiar. The next time you see it, you may find yourself talking about that trip or that first evening in the new house again.