Here's some examples from my own life:
A: My first art show
B: Blueberry picking in Cape Breton as a child
C: Learning to crochet in a craft club
You could also:
- illustrate each, or just a few after you're done your list, or as part of making it.
- create a collage inspired by each that could include images from the actual experience.
- use the idea as a basis for a family memory book to gift to a loved one.