There are 24 days remaining until the end of the year.

7 is a prime (the 4th prime)

999,999/7 = 142,857. Any fraction consisting of an integer divided by 7 will have a repeating decimal consisting of those digits in that order starting at a different, determinable digit unless the numerator is an even multiple of 999,999 or 7. For example, 1/7 = 0.142857142857..., 2/7 = 0.285714285714..., 3/7 = 0.42857142857.... The short-cut is to multiply 0.142857 by the remainder of the long division, and then repeat that decimal component. Thus, the fractional part of 11/7 is 4/7 = 4 x 0.148257 repeated, generating 0.571428571428571428 etc.

This arithmetic oddity was something of a pain for accountants in days of yore because the shortest depreciable life to generate the maximum investment tax credit was 7 years. As a result, 7 was a very popular useful life and the computation of 150% and 200% declining balance depreciation would involve using a rate of either 1.5 x 1/7 or 2 x 1/7.

7 is the most likely result from rolling 2 regular 6 sided dice.
7 is neutral pH
7 is Nitrogen
Old No. 7 is

There are 7 days in a week, 7 colors in the rainbow, 7 seas, 7 continents, 7 Wonders of the ancient world, 7 Dwarves, Rome's 7 hills, the Plieades, and

There were Seven Samurai

And therefore

And the magnificent Lotus 7 & super 7.

Seven is and has been a magik and magikal number in a lot of cultures and religions. I'm just going to take a pass on all of it.
The sole exception is that the Seventh Son is present throughout the US blues and folk genres.

7 BCE was the Year of the Consulship of Nero and Piso (Tiberius Claudius Nero and Gnaeus Calpurnius Piso) and the death of Emperor Cheng of Han and his royal consort Zhao Hede.

7 CE was the Year of the Consulship of Metellus and Nerva. Caesar Augustus was emperor and appointed Publius Quinctilius Varus (yep, that Varus) governor of Germania. Varus almost immediately created a lot of dissension among the various and sundry German tribes, just as he had pissed off the residents of Syria and Judea when stationed in those outposts. This would bite him in the ass in 9 CE at the Battle of the Teutoburg Forest where some of said German tribes annihilated him and his 3 legions. The Romans did, much later, recover their 3 "Eagles", but never again had a 17th, 18th or 19th legion.

And now, December 7 On this date in
43 BCE Marcus Tullius Cicero was assassinated.
1917 The United States declared war on Austria-Hungary. We were already "at war", having declared war on the German Empire on April 6, 1917.
1941 The Imperial Japanese Navy carried out a surprise attack on Pearl Harbor. This should be addequately covered elsewhere.
1965 Pope Paul VI and Patriarch Athenagoras I simultaneously revoked the mutual excommunications that had been in place since 1054.
1972 Apollo 17, the last Apollo moon mission, was launched. The crew took the photograph known as The Blue Marble as they left the Earth. Picture a bright blue ball just spinning, spinning free ...
1988 Yasser Arafat recognized the right of Israel to exist. We're still waiting for Israel to reciprocate as to Palestine.

And, assorted births were recorded such as those listed with the birth year in parentheses:
Abd al-Rahman al-Sufi, a Persian astronomer and author. (903) Famous for his "Book of Fixed Stars".
Gian Lorenzo Bernini, an Italian sculptor and painter. (1598) Invented Baroque sculpture and a big player wrt baroque architecture.
Willa Cather, an American author and poet. (1873) A famous U of Nebraska grad who didn't play football.
Louis Prima, an American singer-songwriter, trumpet player, and actor. (1910) The clown on stage with Keely Smith. A plot fixture in the movie "The Big Night" who never appeared, arguably a MacGuffin.
Eli Wallach, an American actor. (1915) Calvera, Tuco and much movie greatness.
Tom Waits, an American singer-songwriter, guitarist, and actor.(1949)
Larry Bird, an American basketball player and coach. (1956)

And, of course, some deaths.
Cicero, Roman philosopher, lawyer, and politician. (43 bce) as above.
William Bligh, English admiral and politician, 4th Governor of New South Wales. (1817) Yep, Captain Bligh.
Thomas Nast, German-American cartoonist. (1902)
Lefty O'Doul, American baseball player and manager. (1969)
Rube Goldberg, American cartoonist, sculptor, and author. (1970) Brilliant inventor, to boot.
Thornton Wilder, American author and playwright. (1975)
Robert Graves, English author and poet. (1985 - born in 1895)

Eli Wallach did not, to the best of my knowledge, play or sing music, however:
He was the outlaw Calvera in The Magnificent 7

He was Tuco, who tells it like it is

Tuco on turning the other cheek

Tom Waits holding on

Tom Waits and his Chocolate Jesus

Louis Prima Jump Jive An' Wail

Louis Prima - Angelina

Louis Prima - night train

On the seventh hours
On the seventh day
On the seventh month
The seven doctors say
You was born for good luck
And that you'll see
I got seven hundred dollars
And don't you mess with me

Muddy Waters - Hoochie Coochie Man

Johnny Rivers - Seventh Son

Dylan - 7 Days

Paul Evans - "Seven Little Girls Sitting In The Back Seat"

The Allman Brothers Band - Seven Turns

Richie Sambora - Seven Years Gone

The Avons - Seven Little Girls Sitting In The Back Seat (HQ)

Queen - Seven Seas Of Rhye (Lyrics) (Damn, I always thought it was 7 seas of Rye.)

Dave Matthews Band - Seven

Fleetwood Mac - Seven Wonders (Live Video)

Jack Daniel's Old No. 7 - Jerry Lee Lewis

Rush-"Seven Cities of Gold"-2012

Sibelius: Symphony #7 ( Full) - Karajan*