Help Me To Understand This.

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The problem with using event photos is that Suzie the Bride can probably still come after you even if your contract says you're going to take pictures and use them in advertising. It has to do with the fact that the terms of your contract are not negotiated (adhesion) and the question of what reasonable expectation of privacy does a person have when hiring vendors for their private wedding?

Imagine you use a high action and rather sexy photo of Suzie & the groom from when he was removing the garter - despite what your contract says it is very likely you will get burned if you publish such a photo for commercial purposes. This is why stock photos are so common. Plus, with a stock photo or one that you stage yourself - you can get exactly the kind of shot you want.
 
Just BLUR out the faces..... simple