Here is my initial logo idea for your consideration. I incorporated the look of the Hollywood sign on the hill, as well as a star like you would see on the Walk of Fame. The font I chose for "HALLOWEEN" is a similar look to the font of the original Halloween movies; it will instantly visually tie the logo to Hollywood AND Halloween at once.
Let me know if you would like to see any variations or changes made, and I will be happy to provide. Thanks for looking.