Crossword puzzle clue "every 30 days or so"

"Republicans believe every day is the Fourth of July, but the Democrats believe every day is ___ 15" (Ronald Reagan)

He said "Every great film should seem new every time you see it"

One who knows every word on every album

Tournament in which every contestant plays against every other

"___ would be a serious felony since you'd have to take every prop and kidnap every actor"

What every other letter of every answer in this puzzle is

Things that change every 365 days

Every seven days