On 9/19, 9/20, 9/26 and 9/27 annual pass-holders can get early assess to three of the haunted houses and reserved seating for the first showing of Bill and Ted's. Here's the link to sign up:
https://www.universalorlando.com/rsvp/hhn24/rsvp.aspx
https://www.universalorlando.com/rsvp/hhn24/rsvp.aspx