Crossword clues for the word: FESTIVUS The word FESTIVUS has appeared as an answer to at least 4 crossword clues on different crossword puzzles. Crossword clues for FESTIVUS Showing 1 to 4 of 4 results Clue(s) """Seinfeld"" holiday that begins with the Airing of Grievances" "Annual holiday with an ""airing of grievances""" "December holiday inspired by ""Seinfeld""" Holiday celebrated by Kramer and Frank Costanza