If you’re itching to celebrate Halloween before the 31st or to spook it up outside of the traditional trick-or-treaters and themed club nights, X-Scream’s twisted fairy tale Halloween extravaganza ‘Once Upon a Time’ might be the thing for you. Sweeping through the outhouses and grounds of Rhondda Heritage Park and into the old coalmines themselves, X-Scream have set up a rat-run of textured mazes, smoke machines, strobe lights, and ancient elevators furnished with characters from your favourite childhood tales, Disney…