Quadrennial occasion celebrated by this puzzle's theme entries

Question:

Answer:

LEAPDAY

Length:

Similar Crossword Questions:

Like the four theme entries in this puzzle, as it were
What this puzzle's theme entries have
Where to find the theme entries of this puzzle, briefly
It can follow the last word of this puzzle's theme entries
Period that ends Nov. 3rd, requiring a shift, and letters that shift in this puzzle's theme entries
Word hidden in this puzzle's theme entries
There's one at the beginning of each of this puzzle's four theme entries
What are featured in the theme entries of this puzzle
What this puzzle's theme entries take, vowel-wise
Act affectedly, and what this puzzle's theme entries do?
Make of six models that are subject to recall ... and being sent back inside this puzzle's theme entries
Like fish for fish & chips -- or this puzzle's four theme entries
Tone-Loc and Marky Mark and the Funky Bunch, e.g. ... or how this puzzle's theme entries might be described?
What the names in this puzzle's theme entries begin with
"Infections" inside this puzzle's theme entries
The three of this puzzle's theme entries
Physical principle whose equation explains the changes in this puzzle's theme entries
What this puzzle's theme entries probably do?
Like some fillings (as in this puzzle's theme entries)
Find new work - or what you must do to get the three theme entries' names in this puzzle
First of a pair of letters swapped six times in this puzzle's theme entries
Challenged, or what the theme entries in this puzzle should be
They're hidden in this puzzle's theme entries
This puzzle's theme entries
Event celebrated in this puzzle, and an example of how the theme works