DJA - Thankfully, I have a GREAT memory. I never forget a face... so a lot of times I will just walk up to girls I cold opened once before (but did not close) and start in the middle. This works WONDERS. It creates the illusion that the two of you have "known eachother" all the way through youre first meeting, which sets the stage for deeper rapport and more uninhibited attraction.
"Always Be Closing" is a stupid motto. Close only when you have great odds of success. Other times, you can branch off the face recognition weeks later.