Who to contact?
I am not sure whether I should submit. If you are still not sure after reading the call for submissions, submit! If you really have a question, contact an area chair.
I have an issue with the submission process. Contact the publication chair.
I have observed an unethical behavior. Contact the ethics chair.
Who is who — and each chair’s role — is on the committee page.
For any other question: contact the Program Chairs (contact to be announced).