I know this is not a common occurance, but things like this can, and do, happen everywhere.
http://todaynews.today.com/_news/2013/02/05/16837631-rossen-reports-brides-say-company-ruined-their-wedding-day?lite
1. Read your contracts thoroughly. Especially with your higher priced vendors.
2. Get Wedding Insurance (google it). It's a small price to pay for the huge investment you've made.