Noun
cattle call (plural cattle calls)
(idiomatic, performing arts) An audition which is open to the public and thus draws a large number of applicants, many of whom are inexperienced.
I came to New York when I was eighteen years old, and the first audition that I ever went to was this huge cattle call at the Equity building where I had gone two days earlier to sign up - I didn't have an agent or anything. It was for 'Chicago.' There were probably three hundred people there. Kate Levering