I'm guessing they were having their photos taken in the park just adjacent to where this cart was and some uber JW (probably the brides Mother) though it would be cute to get a shot by the literature cart to show all her friends.
The Bride looks as if she's only putting up with it to avoid making a scene and he looks like a bit of a schlub who's hoping the whole thing is over before one of his mates from work sees him.
I remember being at a wedding one Saturday where the Presiding Overseer ran after the bride and groom and flagged them down as they were driving away to leave for their honeymoon. A bunch of us were standing nearby and heard him tell them that there was going to be a really good talk Sunday and he thought it would be a good idea for them to attend. The bride hooted with laughter rolled up her window in his face and the pair of them drove off.
It was classic !