Crossword puzzle clue "there are six hidden in this puzzle in appropriate places"

There are six hidden in this puzzle in appropriate places

Eight three-letter ones are found in appropriate places in this puzzle

Election Day "container" . . . and a hint to six symmetrically-placed containers hidden in this puzzle. Can you find them?

Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize

Picnic serving, and when divided properly, a hint to a hidden feature of six pairs of puzzle answers

They're hidden in this puzzle's six longest answers

Unexpectedly changing one's attitude ... and what's literally hidden in six long puzzle answers

Three-letter combinations hidden in this puzzle's six other longest answers