1918:
Singer & radio personality Dennis Day is born Owen Patrick Eugene McNulty in
The Bronx, New York. He can be heard in Disney's 1948 feature Melody Time; narrating and providing
all the voices for "The Legend of Johnny Appleseed" segment.
1928:
Walt Disney's trademark application for "Mickey Mouse" 
is filed with the United States Patent Office.
1933:
A 23-year-old artist named Wolfgang Reitherman is hired at the Disney Studios in
 Hollywood, California. Reitherman has become an animator by chance - his ambition was to be a
 aeronautical engineer, but he drew cartoons in his spare time at school and eventually decided to study art.
 "Woolie" as he will be nicknamed, will start work in June and go on to become one of Walt's "Nine Old Men".
 1934:
Disney comic illustrator Luciano Gatto is born in Venice, Italy.
1948:
Disney's Donald's Dream Voice, directed by Jack King, is released. Donald tries his hand at selling brushes door-to-door ... but since nobody can understand him, nobody buys anything!
1954:
The Disney cartoon Pigs is Pigs, directed by Jack Kinney, is released. Narrated by
 Gary Owens, the short is a verse adaptation of a turn-of-the-century short story of the same name by Ellis
Parker Butler. The presence of a couple of guinea pigs at the Westcote railroad station creates countless
 offspring as well as a load of paperwork for by-the-book agent Flannery! The short features the sounds of the 
Mellomen - a vocal group which includes Thurl Ravenscroft. (It will be nominated for an Academy Award.)
1961:
The TV series Walt Disney Presents airs "Wonders of the Water World," 
narrated by Winston Hibler.
1993:
CBS-TV airs the 2nd part of the Disney special "The Best of Disney Music: A Legacy in Song."
1998:
The new Disneyland Tomorrowland is unveiled
after being given an extreme facelift. Various dedications will take place over
 the next 2 days. Among the special guests are legendary astronauts Buzz Aldrin and Wally Schirra.
1999:
Disney Presents: Bill Nye the Science Guy wins a 
Daytime Emmy for Outstanding Children's Series.
2001:
In Hawaii, Disney turns the aircraft carrier John C. Stennis into a party ship and outdoor movie theater for the premiere of its summer blockbuster, Pearl Harbor. Movie stars mingle with survivors and top military officers as some 2,000 guests gather on the flight deck of one of America's biggest ships for the screening.
2005:
Actor, director & writer Howard Morris, the original voice of Gopher in Disney's 
Winnie the Pooh features, passes away in Los Angeles, California. Since the early 
60s, he had been a main staple of the Hanna-Barbera Productions vocal team, offering hundreds of voices 
for The FlintstonesThe Jetsons, and Sabrina, the Teenage Witch. (As a director he was responsible for the classic black-and-white pilot of TV's Get Smart as well as episodes of Hogan's Heroes and The Andy Griffith Show - in which he was also known for his comedic role of Ernest T. Bass.)
1957:
Actor Judge Reinhold - Neil Miller in Disney's 1994 live-action feature The Santa 
Clause (and its sequels) - is born in Wilmington, Delaware. (Reinhold has appeared in more than 75 films including Fast Times at Ridgemont HighRuthless People, Beverly Hills Cop, and Swing Vote.)
Walt Disney first leased the 708-acre
 Golden Oak Ranch (just north of their
 Burbank studio) in the late 1950s as a
 film location for the "Spin and Marty"
 segments of the Mickey Mouse Club.
 In 1959, Disney purchased Golden Oak
 Ranch, and over the years acquired
 additional land which brought the
 total  to just under 900 acres!
2008:
During the season finale of American IdolJordin Sparks, last year’s winner, announces that The American Idol Experience, a theme-park version of the show, will open at Disney Hollywood Studios in January 2009. David Cook, who is voted this season's American Idol, shouts "I'm going to Disney World!" during the celebration following the live announcement. It is a rare off-field exception for those famous promotional words, which have almost always been uttered by sports figures. (The attraction will officially open February 14, 2009.)

Disney’s VirtualMagicKingdom.com shuts down at 10 p.m. The free social gaming site, also known as VMK, let players choose and style avatars, chat with other players and play games - all in a virtual theme park environment.
1914:
John Hubley, an Academy Award-winning animator and animation director, is
 born in Marinette, Wisconsin. In 1935, he got a job as a background and layout artist at
 Disney (at the age of 22) and worked on Snow White and the Seven Dwarfs. He later became an art director
 and designed layouts for PinocchioDumboBambi, and "The Rite of Spring" segment for Fantasia. He left
 Disney in 1941 (during the strike) and shortly thereafter become a founder of UPA (United Productions of
 America) - where he designed Mr. Magoo!
1940:
Disney's Pinocchio is generally released in the U.K.
2007:
Actress Scarlett Strallen returns to the title role of the West End production of
 Mary Poppins. She had first joined the London show at the end of 2005 to
 replace original cast member Laura Michelle Kelly.
(In 2008 Strallen will play 'Mary' on Broadway.)
MAY 21
2009:
ASIFA-Hollywood celebrates the 20th anniversary of Walt Disney Animation’s The
 Little Mermaid, with an evening of lively discussion with some of the animators and
 crew members at the Fletcher Jones Foundation Auditorium at Woodbury
 University (in Burbank, California). Special guests include the film’s writers and directors John Musker & Ron Clements, and animators Andreas Deja, Mark Henn, Duncan Marjoribanks, Reuben Aquino and Tina Price.
"I'm going to Disney World!" -David Cook
1943:
Walt Disney writes to painter/illustrator Norman 
Rockwell, thanking him for the painting of The 
Saturday Evening Post cover (dated March 1, 1941). 
Walt tells him that members of the Disney staff have been trooping up to 
his office to admire the gift. "To all of them," Walt writes, "you are some 
sort of a god." Rockwell is enjoying a broad popular appeal in the 
United States as he is famous for the cover illustrations of everyday 
life scenarios he creates for The Saturday Evening Post magazine.
MAY 21
THIS DAY MADE IN THE USA
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Disney hires Woolie Reitherman
"The more you find out about the world, the more opportunities there are to laugh at it."
-Bill Nye the Science Guy 
2002:
The CD You Were Mad for Me/In Disneyland, made up of 2 Freddie & the
 Dreamers' albums - 1964's You Were Mad for Me and 1966's In Disneyland, is
 released. You Were Mad for Me was the group's second album and features covers such as "It Doesn't
 Matter Anymore" and "What I'd Say." In Disneyland, originally only issued in the U.K., is made up of covers of
 songs associated with Disney films including "When You Wish Upon a Star," "Supercalifragilisticexpialidocious,"
 and "Whistle While You Work." (Freddie & the Dreamers were one of the many British bands that rode on the
 popularity wave created by the Beatles in the mid-1960s.)
2010:
The 2010 Star Wars Weekends officially begin at Disney's Hollywood Studios.
There will be 4 consecutive weekends in all: May 21-23, May 28-30, June 4-6, and June 11-13.
1992:
Actor Hutchings Royal "Hutch" Dano, known for his role as Zeke Valconi on the
 Disney sitcom Zeke & Luther, is born in Santa Monica, California. Also appearing on The
 Suite Life on Deck, Dano is the grandson of Royal Dano (the original voice of Great Moments with Mr. Lincoln).
2004:
Today is the start of the second of five consecutive Star Wars Weekends at Disney-
MGM Studios. Celebrity guests for the next 3 days include Peter Mayhew (best to known to fans as the towering and ever-loyal Wookiee, Chewbacca) and Jerome Blake (who played a variety of roles in Episode I, from the slimy Neimoidian schemer Rune Haako, to Mas Amedda, the booming voice of order in the Galactic Senate). 
1984:
Clarence "Ducky" Nash leaves Donald's "footprints" in cement at the Chinese Theater in Hollywood, California.

MAY
As part of the massive grand opening of the new American Idol Experience attraction at Disney's Hollywood Studios on February 12, 2009, American Idol winners David Cook and Carrie Underwood sang a duet for the media inside the new attraction's theater. They performed Fleetwood Mac's 
"Go Your Own Way." Cook is no stranger to the Florida resort, in December 2008 he took part in the filming of the Walt Disney World Christmas Day Parade and in August 2009 vacationed with family at WDW.
Photo by Bernie at Disney.Rocket9.net

May 21
2015:
The premiere performances of "Paint the Night" parade and "Disneyland Forever" 
fireworks takes place at Disneyland park. Both additions to Disneyland's 60th birthday 
bash (which kicks off the following day), the parade and fireworks are broadcast live on 
the Disney Parks blog.