Related Clues:

• Many Guinness listings
• There are 12 in a year
• Ones for the record books
• Breakthroughs
• Precedent setters
• Groundbreakers
• Historic happenings
• Record book listings
• History-making events
• Historic events
• New records
• Unprecedented events
• Gold-medal wins
• Noteworthy events
• Never-happened-before events