I don't understand how a DAO would solve their problems. One problem they listed is having a bank account which would hold onto money from a few sponsors tempo

I don't understand how a DAO would solve their problems. One problem they listed is having a bank account which would hold onto money from a few sponsors temporarily for a particular conference, before paying it out to catering, venue, and airfare. How would that work for a DAO? Would you have to write a new contract for each conference? What about paying for last minute arrangements (a flight gets diverted and you need to pay more for travel)? Would the contract allow for that, or block that spending of funds? Actually, how would it block the spending of funds, or tell what you are spending the money on? It's not like Delta has a bitcoin address you can specify in the smart-contract. You have to pay them in dollars.