I’m not sure my approach will help, especially since I use the U.S. date format of MMDDYYYY. But when I’ve memorized specific dates, my approach is to have an image for the month that is based on a natural association with that word/month. April is rain, December is a Christmas tree, July is fireworks, etc. The DD is an image based on the Major system. For a four-digit year, I use animals/creatures based on the Major system to represent the century; those animals/creatures then have an action or object that represents the last YY of the year. (If all of your dates are going to start with 19__, then maybe you can skip encoding that information entirely.)
For me, 19 would be a tabby cat. So, 1901-1918 might be represented by a tabby cat (19) wearing a suit (01) and walking toward a dove (18). That “walking toward” also acts as a way of connecting 1901 to 1918.
For 19 January 1918—which I’d have as January 19, 1918—my image would be my Aunt Jan (January) sitting in a tub (19) with a tabby cat (19) with its paw around a dove (18) (or maybe dove feathers poking out of its mouth). You would just have to link that scene to whatever your Event B happens to be.
My system, although it’s quirky, doesn’t depend on always using the same images to represent specific numbers. Using the Major system, I can create variations that allow me to, say, always use a tabby cat to represent a century. If I see a tabby cat, I know it’s not just representing the number 19; it’s a century. If I need just the number 19, then I usually use “tub.” And if I need to imagine a specific person for some reason, then Tim Burton can also represent 19. (I hope all of that makes sense.)