Question: What was the title character of a 90th birthday special participated in by Thelma Mae Harper made honorary mayor of?

Context articles: Winnie-the-Pooh Meets the Queen
Thelma Griffith Haynes
Heber Harper
Queen Elizabeth Scholarship Trust
Betty White
Alfred Kohn
Nelson Mandela 90th Birthday Tribute
Mike Sheerin
Thelma Harper
Selective Training and Service Act of 1940

Winnie-the-Pooh Meets the Queen (e-book edition published as Winnie-the-Pooh and the Royal Birthday) is a 2016 children's book written to celebrate the 90th birthdays of both the fictional character Winnie-the-Pooh and Queen Elizabeth II in 2016.
 The Queen celebrated her 90th Official Birthday on 11 June, although her actual birthday is 21 April 1926.
 The first "Winnie-the-Pooh" book, written by A. A. Milne, was published in October 1926.
 This original story imagines a meeting between Pooh and Queen Elizabeth at Buckingham Palace.
 The text was written by Jane Riordan while illustrations were by Mark Burgess in the style of the original drawings by E. H. Shepard.
Thelma Griffith Haynes (ca. 1913 – October 15, 1995) was a Canadian–American club owner (1955–84) in Major League Baseball.
 Born Thelma Mae Robertson in Montréal, Québec, she was the niece of Clark Griffith, a former star pitcher who became manager (1912–20) and then president and chief stockholder of the Washington Senators (1920 until his death in 1955).
 The Senators relocated to Minneapolis–Saint Paul in the autumn of 1960 and have been known as the Minnesota Twins since 1961.
Heber Reece Harper (1885 – 1969) served as the fourth chancellor of the University of Denver (DU) from 1922 to 1927.
 Harper was born in Manchester, England in 1885.
 He received degrees in theology from both Boston University and Allegheny College.
 While at DU Harper established the Social Science Foundation which eventually grew into the Graduate School of International Relations.
 After serving as DU’s chancellor he earned a PhD in philosophy from Columbia University in 1931 and remained there to teach for five years.
 In 1936 he was appointed regional director of the social security office in Denver.
 During World War II he served as a member of the US State Department staff.
 Harper made two separate personal $100,000 contributions to DU, the first in 1961 for the Mary Reece Harper Humanities Garden in memory of his mother and the second in 1966 to the DU Humanities Endowment Fund.
 He retired in 1952 and died in October 1969 at the age of 84.
The Queen Elizabeth Scholarship Trust (affectionately known as QEST) is an art and craft educational trust created to sustain traditional British craftsmanship.
 It is a British institution committed to helping support craftspeople of all ages and from all backgrounds, at a critical stage in their careers.
 The trust was established in 1990 to celebrate the 150th anniversary of the Royal Warrant Holders Association and the 90th birthday of Queen Elizabeth The Queen Mother.
 In 2016, QEST welcomed Her Majesty The Queen Elizabeth II as Patron in her 90th birthday year.
Betty Marion White Ludden (known professionally as Betty White; born January 17, 1922) is an American actress and comedian, with the longest television career of a female entertainer.
 Regarded as a pioneer of television, she was one of the first women to have control both in front of and behind the camera; and is recognized as the first woman to produce a sitcom, which contributed to her receiving the honorary title "Mayor of Hollywood" in 1955.
Alfred Kohn (22 February 1867 – 15 January 1959) was the head of the Institute of Histology at the Medical Faculty of German University in Prague for 26 years.
 He entered the history of medicine by discovery of the nature and origin of parathyroid glands and by pioneering research into chromaffin cells and sympathetic paraganglia.
 Kohn's papers on the pituitary, interstitial cells of testes, and ovaries are also related to endocrinology.
 All his studies are based on descriptive and comparative histological and embryological observations.
 Kohn was twice the dean of German Medical Faculty, and a member or honorary member of many important scientific societies.
 He was repeatedly nominated for Nobel Prize for physiology and medicine.
 For his Jewish origin he was expelled from Deutsche Gesellschaft der Wissenschaften und Künste für die Tschechoslowakische Republik in 1939 and transported to Terezin (Theresienstadt) ghetto in 1943.
 After the war he lived in Prague.
 On the occasion of his 90th birthday he was elected honorary president of Anatomische Gesellschaft and awarded by the Czechoslovak Order of Labour.
The Nelson Mandela 90th Birthday Tribute was held in Hyde Park, London on 27 June 2008 to commemorate Nelson Mandela's ninetieth birthday (18 July).
 The concert formed part of the 46664 concert series to promote awareness of the HIV/AIDS pandemic, and came twenty years after the 1988 Nelson Mandela 70th Birthday Tribute Concert at Wembley, held while Mandela was still in prison.
Mike Sheerin is a Canadian, Toronto-based television producer.
 He started Architect Films - which currently produces Decked Out, Deck Wars and Ice Cold Cash.
 Before starting Architect Films in 2010, Mike Sheerin was a documentary director/producer.
 His documentaries include: Hunting Arrows (CBC Newsworld, 2001), The Biographer's Voice (CBC/90th Parallel Productions, 2005), The Degrassi Story (CTV/90th Parallel Productions, 2005), The Secret Mulroney Tapes (CBC/90th Parallel, 2005), Encounters with Moses (CBC/90th Parallel, 2006), Welcome to Canadaville (CTV/90th Parallel, 2007), Bravo Company: Kandahar (History Television/90th Parallel, 2007) and The Path to War (Global/90th Parallel, 2008).
Thelma Mae Harper (nee Crowley), also known as Mama, is a fictional character played by American actress Vicki Lawrence.
 She is a senior citizen who has lived in an unspecified part in the Southern United States for her entire life which is evident by the southern drawl of her speech and her customs.
 She is an exaggerated version of a prototype middle twentieth century lower middle class grandmother in the southern United States.
 Vicki Lawrence, the actress who originated Mama, born April 14, 1949, created Mama in the mid-seventies and undoubtedly based Mama on actual grandmother figures she knew while growing up in the '50s and '60s.
 Mama first appeared as a supporting character in "The Family" sketches on "The Carol Burnett Show" which aired on CBS from 1967 until 1978.
 In 1982, "Eunice" was a made-for-TV movie based on "The Family" sketches characters. "
Mama's Family" (first on NBC, then revolutionized in first-run syndication), and finally in the ongoing "Vicki Lawrence & Mama: A Two-Woman Show".
 With Lawrence continuing to play the role into the present day, the "Mama" character has made numerous other post-television show appearances, such as on "Hollywood Squares"; "The Talk"; ""Larry the Cable Guy's Christmas Spectacular"" (2007); ""Betty White's 2nd Annual 90th Birthday"" (February 5, 2013); "The Queen Latifah Show" (May 20, 2014) etc.
The Selective Training and Service Act of 1940, also known as the Burke-Wadsworth Act, Pub.L.
 76–783 , 54 Stat.
 885 , enacted  16, 1940 , was the first peacetime conscription in United States history.
 This Selective Service Act required that men who had reached their 21st birthday but had not yet reached their 36th birthday register with local draft boards.
 Later, when the U.S. entered World War II, all men from their 18th birthday until the day before their 45th birthday were made subject to military service, and all men from their 18th birthday until the day before their 65th birthday were required to register.