I like this, I can imagine using it for a wedding. I'm worried about distribution since weddings are so rare. Is there a channel you can use to get your app into the couple's hands, that doesn't require them to tell their friends?
We have considered creating a vendor focused service, but there are a couple of services in this space (Honeybook.com).
Love to hear any thoughts you or the rest of the HN audience has to say about this.