The race track is the worst for me. Seems a LOT of people know me, but, it was a year ago(2,3,4) when I met them, ONCE, and I surely don't remember them. I always smile and be friendly, but cringing inside LOL!!! The worst part as we age, we change, and it gets harder to recognize. Though, like Doug, the more we see/talk, the easier it is to remember.
I told Karen, years back, when I first took her to the track....there's going to be LOTS of people coming up to me, don't get insulted if I don't introduce you as 3/4 of them I won't remember who they are!!