I agree with everyone who says it's wrong to stalk to a guy following a private signing. I get players at games, practice, paid signings and free signings. Anything beyond that, I'll pass. I grew up in Kansas City, and my idol was Bo Jackson. When I was 8 years old, I was at the grocery store with my mom, and sure enough, Bo was there shopping. I wanted to have him sign something for me, but my mom said, no, that he was on his personal time. They're just people, and while I love collecting, there are many lines I won't cross, and the lesson was learned that day in the grocery store. Those who do cross the line, are the ones that annoy players making them less likely to sign at games and practices.
I don't need anyone's signature that badly that I'll stalk a player simply because I know where he'll be a given time.