Related Clues:

• Possibly the main one
• It could be the main one
• The main one at the Garden, perhaps
• Sporting contest
• Unlimited number in major incident
• Still time to make the game, perhaps
• Happening to have key, opening below
• Race contest; occasion
• Occasion; sports contest
• European introducing opening item in sports programme
• Occurrence; occasion
• Equally balanced before start of the contest
• Happening in 'seventy-four
• Ordinal has covers torn off — it happens
• Equal, then time added on? It's all happening!