Just submitting an application to a major union (such as the DGA or IATSE) to be signatory on your show does not mean your show is represented by that union. All unions will respond to applications. If you don’t hear a response... something is very fucking wrong. Call that union before your show starts and find out the status of your application. The union needs to make sure your show is legit, the money is there, and their members don’t get screwed. They need to approve your application.