Spooky Halloween party, potluck sign-up sheet, haunted house background, dim lighting, cobwebs, jack-o'-lanterns, black cat, witch's hat, broomstick, sign-up sheet with a wooden clipboard, orange and black balloons, autumn leaves, grave stones, spooky trees, full moon, creepy sounds, eerie atmosphere, warm and cozy indoor lighting, rustic wooden table, vintage decorations. Let me know if you need any further assistance!