By the Light of the Moon - Thirst of the Serpent God - Nights of Lost Souls - The Shambling Plague are updates released over several years. Some included new content, like the introduction of The Palace of Cetriss, and Special Membership Offers.
The ‘Halloween Event’ hasn’t always started the same date. Sometime between the 19th-22nd? Community Manager @AndyB has confirmed start dates and content in the past.
