Western Front
Oddly enough, none of my sources list anything for this day; the Battle of the Somme was entering a 'relatively' quiet phase, as the British consolidated, and prepared for the next push; likewise, both sides on the Battle of Verdun were pretty much licking their wounds.
All Quiet on the Western Front?

Eastern Front
Fighter Ace Oswald Boelcke on visit to Kovel; invites Manfred von Richthofen to join his new unit on the Western Front.
Brusilov Offensive: Brusilov has received 26 extra divisions since June 12 (but Austro-Germans 33 1/2, including 23 German).
Galicia: Lechitski reaches Solotwina west of Stanislau, gains heights south of Jablonitsa Pass (August 22). Another Russian force reaches Zlota-Lipa, south of Brzezany.

Southern Front
Isonzo: Italians take more trenches east of Gorizia.

Asiatic and Egyptian Theaters
Armenia: Mush and Bitlis reoccupied by Turkish forces (see 24th, February 18th and March 2nd). Fighting starts south of Kigi between Turkish IV Corps and new 6th Caucasus Rifle Division which drives former south of Ognot (August 18-25).

Naval and Overseas Operations
North Sea: Royal Navy submarines E-41 and E-4 collide and sink on exercise (15 survivors); both boats salvaged and E-41 reused.
East Africa: Bagamoyo occupied by British forces. British clear of Nguru Mts., drive enemy force southward and eastward.

Political, etc.
United Kingdom: British newspapers call for a quarantine of the U.S. to prevent the polio epidemic in New York City from spreading.
Britain announce an agreement with Italy to supply it with coal and other supplies necessary for the war effort.
The King returns from a visit to the Armies on Western Front.
United States: President Wilson meets with union leaders representing 400,000 trainmen to avert a possible national railway strike.
Treaty transferring the Danish West Indies to the U.S. for $25 million (about $553 million today) is signed.

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On the kinkometer, my kink measures as a sine wave.