Stumped by ‘Many a Fed. Holiday’ crossword? Crack the code!

As an astute detective, I carefully dissected the crossword clue “Many a fed. holiday” to unravel its hidden meaning.
Initially, the term “fed. holiday” indicated that the answer lies within the realm of federal holidays, leading me to consider public holidays celebrated across the United States.
With this insight in mind, I pondered the term “many,” suggesting that the answer is a recurring event.
Considering federal holidays that occur frequently, I realized that Mondays are highly significant.
Most public holidays, such as Memorial Day, Labor Day, and Presidents’ Day, consistently fall on a Monday, allowing for long weekends.
Hence, the answer to this intriguing clue would be ‘MON,’ an abbreviation referring to the many federal holidays that fall on Mondays.
The satisfaction of unraveling this enigma lay not only in following the logical breadcrumbs but also in uncovering the significance of Mondays as a commonly observed day for federal holidays—a captivating realization that highlighted the thought process across this mysterious crossword clue.