Question: San Jacinto Day is the celebration of the Battle of San Jacinto in what year?

Context articles: San Jacinto Peak
Rancho San Jacinto Viejo
San Jacinto Monument
Battle of San Jacinto
Rancho San Jacinto Sobrante
San Jacinto Valley
San Gorgonio Pass
USS San Jacinto (1850)
San Jacinto High School (San Jacinto, California)
San Jacinto Day

San Jacinto Peak (often designated Mount San Jacinto, pronounced or ) is the highest peak of the San Jacinto Mountains, and of Riverside County, California.
 It lies within Mount San Jacinto State Park.
 Naturalist John Muir wrote of San Jacinto Peak, "The view from San Jacinto is the most sublime spectacle to be found anywhere on this earth!"
Rancho San Jacinto Viejo was a 35503 acre Mexican land grant in present-day Riverside County, California given in 1842 by Governor Pro-tem Manuel Jimeno to José Antonio Estudillo.
 At the time of the US Patent, Rancho San Jacinto Viejo was a part of San Diego County.
 The County of Riverside was created by the California Legislature in 1893 by taking land from both San Bernardino and San Diego Counties.
 The grant encompassed present-day Hemet and San Jacinto.
The San Jacinto Monument is a 567.31 ft column located on the Houston Ship Channel in unincorporated Harris County, Texas, United States, near the city of Houston.
 The monument is topped with a 220-ton star that commemorates the site of the Battle of San Jacinto, the decisive battle of the Texas Revolution.
 The monument, constructed between 1936 and 1939 and dedicated on April 21, 1939, is the world's tallest masonry column and is part of the San Jacinto Battleground State Historic Site.
 By comparison, the Washington Monument is 554.612 ft tall, but remains the tallest stone monument in the world.
 The column is an octagonal shaft topped with a 34 ft Lone Star – the symbol of Texas.
 Visitors can take an elevator to the monument's observation deck for a view of Houston and the Battleship Texas (see USS "Texas" ).
The Battle of San Jacinto, fought on April 21, 1836, in present-day Harris County, Texas, was the decisive battle of the Texas Revolution.
 Led by General Sam Houston, the Texian Army engaged and defeated General Antonio López de Santa Anna's Mexican army in a fight that lasted just 18 minutes.
Rancho San Jacinto Sobrante was a 48,847 acre Mexican land grant in present day Riverside County, California given in 1846 by Governor Pío Pico to María del Rosario Estudillo de Aguirre.
 The Rancho San Jacinto Sobrante grant was of the surplus or "sobrante" of Jose Antonio Estudillo's Rancho San Jacinto Viejo and Miguel Pedrorena's Rancho San Jacinto Nuevo y Potrero.
 The grant encompassed present day Lake Mathews.
 At the time of the US patent, Rancho San Jacinto Sobrante was a part of San Bernardino County.
 The County of Riverside was created by the California Legislature in 1893 by taking land from both San Diego and San Bernardino Counties.
The San Jacinto Valley is a valley located in south western Riverside County, in Southern California.
The valley is located at the base of the San Jacinto Mountains in the east and Santa Rosa Hills to the south with the San Gorgonio Pass to the north.
 The elevation on average is 1500 feet, with the highest points in the foothills south of Hemet and the western slopes of the San Jacinto Mountains.
 It is home to two cities, Hemet and San Jacinto.
 The combined population of the valley is over 100,000 residents.
 The valley is also where the story and play "Ramona" was set, the story was written after author Helen Hunt Jackson visited the valley in the 1880s.
 The valley is also known for being an area of agriculture, which has given way to more urbanized development as time goes on.
San Gorgonio Pass, sometimes referred to as Banning Pass due to the location of Banning, California at the western end of the pass, el.
 2600 ft , is a gap on the rim of the Great Basin between the San Bernardino Mountains to the north and the San Jacinto Mountains to the south, carrying Interstate 10 and the Union Pacific Railroad between the Los Angeles basin and the Coachella Valley.
 Like Cajon Pass to the northwest, it was created by the San Andreas Fault, with the valleys leading up to the pass aligned with the fault.
 The pass is not as steep as Cajon or Tejon passes, but it is one of the deepest mountain passes in the 48 contiguous states, with the mountains to either side rising almost 9000 ft above it.
 San Gorgonio Mountain, taller but farther away and less visible, is at the northern side of the pass, and Mount San Jacinto is on the southern side.
 Mount San Jacinto has the fifth-largest rock wall in North America, and its peak is only six miles south of Interstate 10.
 Today, San Gorgonio Pass is used by commuters from the Greater San Bernardino Area to travel through the mountains to Palm Springs and the Coachella Valley, and points further east, all the way to Phoenix, Arizona.
The first USS "San Jacinto" was an early screw frigate in the United States Navy during the mid-19th century.
 She was named for the San Jacinto River, site of the Battle of San Jacinto during the Texas Revolution.
 She is perhaps best known for her role in the Trent Affair of 1861.
San Jacinto High School is the only major public high school in the city of San Jacinto, California.
 The other high school in San Jacinto, Mountain View High School, is a small alternative school located near San Jacinto High's campus.
San Jacinto Day is the celebration of the Battle of San Jacinto on April 21, 1836.
 It was the final battle of the Texas Revolution where Texas won its independence from Mexico.