Posters are 11" x 17"  300 dpi .psd files.  My hope is that I shall need to rearrange text or graphic elements to accommodate festival laurels before printing your poster for framing at some later date.  Thus it must be possible to edit your Photoshop layers.  This requires that you submit the poster in a folder which includes its fonts – especially if they are non-standard typestyles you've downloaded for their particular design effect.

Ben Schott does an excellent job of explaining how and why names are arranged on a film posters.  Use his article in The New York Times Sunday Review as a template for your own.  Prescribed fonts for your billing block are available on the server.