Imagine the tying of bows as a metaphor: is the bride tying things up? Maybe the physical act of tying hundred of bows gave her a sense of control when other things felt out of control. Or, maybe it means that she had some relational loose ends to tie up before she got married, but instead of doing the work emotionally, she was trying to do it physically.
The hunt for placecards brought joy to that bride. It could be that her interest in placecards helped her literalize her wedding - helped make it more real. Or, possibly, the placecards were a way for her to make order of imagining her loved ones coming to her wedding.
The detail that a bride chooses can tell her something about what's going on, emotionally, for her that she may not have been aware of.
Consider: what are your secret details? What might you be trying to work out, emotionally, through them? What new information about your emotional life do you glean from looking at your secret detail metaphorically?
Why do all of this? Because the more you understand your emotional experience, the more you'll be able to feel all the joy and love of this amazing time of life.