I am an aspiring young actress, and would love the oppertunity to audition for a role, do you know anything about when this might be taking place, the company Mr Gaiman uses for his audition process, or anything else I could find useful?

Get an agent. There is no alternative.


Authors very very very very very rarely will have any control over who appears in films of their works, unless they also hold a producer position. Not an Executive Producer, which is generally no more than an ego stroke, but actual producer.