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

Question:

Length:

Similar Crossword Questions:

Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
"Be careful what you say," and a hint to a feature shared by this puzzle's perimeter answers
Word that can follow the first word of this puzzle's four longest answers
Word hidden in this puzzle's longest answers
Word "split" in this puzzle's eight longest answers
Picnic serving, and when divided properly, a hint to a hidden feature of six pairs of puzzle answers
Number inaugurated into this puzzle's theme answers
Word for "beginning" that encloses four answers in this puzzle
Word before the first word in this puzzle's theme answers
Word that can precede the last word of the four longest puzzle answers
Worries, and word anagrammed in part of four puzzle answers
Word that precedes six other answers in this puzzle
Word separated in this puzzle's six longest answers
1987 market crash, and this puzzle's title, whose first word can precede each word in the starred answers
Word replaced in three answers in this puzzle
Word that goes after the start of and before the end of the five longest answers in this puzzle
Coastal irregularities, and word anagrammed in this puzzle's four longest answers
Radio studio feature, and what each of this puzzle's four other longest answers literally is
TV feature, and a clue to six other answers in this puzzle
Weather Channel feature (it's the puzzle theme found in a quintet of answers)
The last word of this puzzle's five longest answers is a type of one
Action hero's garb, and what each first word in this puzzle's four longest answers is
Wee hr., and a hint to a feature common to this puzzle's four longest answers
The word, as suggested by the saying formed by the ends of this puzzle's four longest answers
Word needed to be added to 12 appropriately placed answers in this puzzle for their clues to make sense