I've done some in the past, but I'll try to get out and do something new for the challenge.  Does your camera have an articulated screen?  That's very helpful for getting candid shots.  If your screen is folded out and your FACE is pointed 90 degrees away from somebody, your lens can be staring right at them and they're unpreturbed.  Of course if you're Andrea, you can get pictures of perfect strangers anywhere you want.  What on earth DOES she say to people to get those shots?  LOL!  I just settle for candids.  :P

"If your pictures aren't good enough, you're not close enough."  ...  Robert Capa