What is the title of the fourth episode of Season 2 of Pretty Little Liars, and what key event occurs in the [Blind Dates episode]?

The title of the fourth episode of Season 2 of Pretty Little Liars is "Blind Dates." In this episode, Spencer pawns her sister's wedding ring and receives a rusty horseshoe in return, leading to a series of events involving the mysterious character "A" and keeping viewers on the edge of their seats with its twists and turns.