This one's tough because weddings are close to the hearts, wallets, and our natural discretion on nepotism.
Finding new couples each and every day is the most expensive thing about this business.
ThumbTack attempts to do something like this. As a super ghetto immature growth tactic to let wedding DJ's know about the app I was marketing, I "requested bids" in 47 states for a wedding that was priced high for the app's founders. The requirement for the DJ's was they had to download the app and go through a quiz on how it works.
Lots of reasons why this is a tough space, but primarily anyone bidding on weddings probably is of low quality. Tough decision/motivation matrix here. I'd graph it out on a whiteboard and talk to all players.
DJs, caterers, etc... good thing is they're all reachable to have conversations with and many are struggling to find consistent gigs.