Input (grade 13): The 8-day Blackpool Dance Festival is the world's first and most famous annual ballroom dance competition of international significance, held in the Empress Ballroom at the Winter Gardens, Blackpool, England since 1920.
Output (grade 10): The 8-day Blackpool Dance Festival is the world's first and most famous annual ballroom dance competition of international significance. It has been held in the Winter Gardens, Blackpool, England since 1920 (except for war-time).