This thread is over a year old and has nothing to do with the current Halloween 2020, which is what I'm assuming you're referring to.
Did you do both tasks of turning on the music / turning the lights off?
If you're stuck & can't do those tasks, then try clearing the game cache / cookies. If on mobile & have registered your game with an email / password or Facebook, then reinstall the app.
If still no joy, create a SUPPORT TICKET via the button under the Settings wheel, upper corner. Once on the page, scroll PAST the white search box & choose a category to begin the form.