Spoiler (click to reveal)
How to Get the Bride Married:
1. Kill the chosen groom. He then becomes a ghost under your control. He drops all items, including the Ring.
2. Put the chosen groom and the Bride in the Chapel.
3. Start the wedding.
4. At the end of each of your turns, advance the Turn/Damage Track to the next number, beginning with 1. The wedding will be complete on Turn 3.
My interpretation of the wording of step 2 is that the figures are immediately placed in the Chapel, without having to roll for movement, etc., and this is why no Speed is listed for the ghostly groom. If the intention had been to force the traitor player to move those figures in the usual way (rolling dice, counting spaces), then the word "Move" would have been used instead of "Put", and he would have been given a Speed trait.
So, effectively, once killed, his figure is moved immediately to the Chapel (and no longer matters to the story).