Maybe your Anniversary date would be emotionally damaging to you? You might want to choose a different date just because the anniversary is a tough one all on its own. Just a thought for you to consider. I will see if this link works for you for the memorial book:
I ordered this book for my Husbands Memorial. I like the idea of having fond memories of those he has touched.
https://www.amazon.com/gp/product/1935414291/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
As others have said, let your Aunt talk about him and take her lead as to how to handle special dates. Your love for your Uncle shines brightly my friend! And that is the best way to celebrate him.