It's a start. You can't topple a giant by smashing into them head-on.
I agree with the fact that this is not "disruptive", when I opened the post I expected to get something that can help you cater you wedding for a fraction of the price or something, or a mechanism for to shop and rate wedding planners, something.
Now a REAL wedding disruptor would be a tool that auto-generates video/photos of you and your family at a wedding so you can send those out and skip whole wedding nonsense, and go drinking with all your combined friends for the evening.
No offense but...you've never been married, have you?
A wedding is a lot like a startup -- there's a whole lot of pain and frustration getting it launched, but launch day is a hell of a lot of fun -- not just for the bride and groom, but for the family and friends too. (The difference is that most people want a wedding.)
Besides, even if you found a customer base that would be willing to buy this, your mother would shoot you for not having her to your wedding. :>