Crossword puzzle clue "river phenomena or what literally happens six times in this puzzle"

River phenomena (or what literally happens six times in this puzzle)

Certain filings, and what happens literally in six of this puzzle's answers

Cause "total protonic reversal," according to "Ghostbusters"...or what happens literally four times in this puzzle

Ironic change in destiny ... and, literally, what happens in this puzzle's circles

"For his contributions to jazz, ___ should be smeared with bacon grease, placed in a cage with three underfed Kodiak grizzly bears, and whatever happens, happens." ("Genius Guide to Jazz")

"Whatever happens, happens"

It happens four times a year ... and also in this puzzle's circles

Much-covered 1956 Screamin' Jay Hawkins song ... hinting at what happens three times in this puzzle's solution