| Clue | Source | Date |
|---|---|---|
| Tour that featured bands such as Black Sabbath and Disturbed | ||
| Tour often featuring Black Sabbath | New York Times | 19 Dec 2015 |
| Big metal spectacle | Newsday | 12 Sep 2015 |
| Big metal spectacle | ||
| Tour often featuring Black Sabbath | ||
| Annual heavy metal tour | ||
| Annual heavy metal tour |