SeaWorld Orlando's Howl-O-Scream has now announced two houses, two scarezones, and two themed bars for its inaugural event.
Steakhouse 55 at the Disneyland Hotel has existed in its current form since 2006.
The restriction limiting attendance to California residents will be lifted on the same day at Knott's regional rival Disneyland.
Cedar Fair is having to raise wages, step up recruitment and offer signing bonuses to fill available jobs.
Knott's Berry Farm is offering season passes for $101, which is less than a 1-day Disneyland ticket.
Contrary to early reports, California's theme park industry is not recommending a ban on screaming on thrill rides.