When and where are the auditions for the Skulduggery Pleasant movie held?

There are neither confirmed production dates or confirmed casting arrangements for any upcoming Skulduggery Pleasant movie, as of mid-2013. This means that the earliest yoiu could see public information on it would be 2014. Derek Landy has been working in earnest on a script for Warner Brothers since 2012.

If you are an actor, your agent can contact Warner Brothers directly to see if anyone has been signed to actually develop the movie.