Turns out it IS easy. Here is the link: http://blog.washingtonpost.com/fact-checker/2007/12/hillary_and_martin_luther_king.html
She said she saw MLK in January of 1963, but the sermon she says she remembers was given in April of 1962. I doubt she was there at all.
The speech she remembers was actually given in one of the Arkansas churches as it was burning down, so the records were destroyed before Sir Edmund could actually verify them.
I posted a comment a moment ago. How long did they take to actually put the comments on the site?
I was the one who made the initial inquiry about this to the FactChecker. You can read my whole story here