I basically just scrap what I can remember....however, I have an uncanny memory and can remember the littlest of things & details LOL! HOWEVER...I don't remember it all (by a long shot ;p) so what I try to do is ask Matt or one of the older kids or other people in the pictures if they remember
My MIL and my mom both have great memories and since ALOT of my pictures involve family time with all of them, I tend to lean on them if it is something I really want to document.
I'm also glad that even though my digi skills were not the best when I started digi scrapping (2006ish) that I did document the majority of the stories so I can always go back and "redo" older LO's....one of last month's challenges was a "redo" of an older LO and I thought that was a great challenge and think I will continue to "remake" some older LO's