Almost all of my best shots are "candids". That being said, I do them at scheduled events where they know that I'll be shooting, just not what at. That way, I get good pics but not posed pics. For instance, most of my better stuff (and most frequent) is at outdoor events, hikes, primitive get-togethers, etc. I make it perfectly aware that I am taking pics that I might post, and that I will feel that way about each subject/event unless the individual personally tells me otherwise- in which case, their image won't be used. If I accidentally get them in one, I usually offer it to them before distroying it. I keep a couple of releases on hand just in case I find that special project, but almost never use them. This would change if I were writing for a magazine or something. So far, it has worked for me.