There are a lot of ways to help you sharpen your memory. In my case, I often used "mnemonic devices," my simple way of remembering things through associating a certain word/phrase or thing to something I am very much familiar with. One of these mnemonic devices that I have been using are photos or anything that I can visualize, songs and even cracking of jokes. And all these do contribute a lot in helping me recall a specific event that leads me to the information that I can hardly recall.

I fervently wish that may you be able to sharpen your memory through this technique. Good luck!