A Standard Season Pass cannot be used for free entry during Scarefest as per the terms and conditions of the Season Pass.
If you wish to visit during Scarefest, you will be required to purchase a £10 entry ticket online in advance here and scrolling down to "Discounted Extra Day Tickets". Please note: This ticket is only available for 2019 Season holders, a valid Season Pass must be presented per person on arrival.
Premium Season Pass holders can visit as many times as they like until November 3rd, including Scarefest, with one entry for the Alton Towers Dungeon included in every visit.
Please note: Maze entry is not included. This can be purchased separately.
For a full list of Season Pass benefits visit here