Crossword puzzle clue "masquerader's event"

Masquerader's event

Proctored event, or proctologist's event

Go from event to event

___ rally (event before a high school sporting event)

Event before the main event

Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle

Momentous event in baseball history, as it turned out?

Unexpected event