Shows

• Hello, Dolly!: 60th Broadway anniversary (16 January 1964)
• Murder on the Nile: 80th premiere anniversary (17 January 1944)
• You're a Good Man, Charlie Brown (Revised): 25th Broadway anniversary (4 February 1999)
• A Raisin in the Sun: 65th Broadway anniversary (11 March 1959)
• Funny Girl: 60th Broadway anniversary (26 March 1964)
• Rodgers & Hammerstein's South Pacific: 75th Broadway anniversary (7 April 1949)
• Calendar Girls: 25th original calendar release anniversary (12 April 1999)
• Big River: 40th Broadway anniversary (25 April 1985)
• Gypsy: 65th Broadway anniversary (21 May 1959)
• The SpongeBob Musical 25th anniversary year of Nickelodeon's SpongeBob SquarePants (June 1999)
• And Then There Were None: 80th Broadway anniversary (27 June 1944)
• Shakespeare in Love: 10th West End anniversary (23 July 2014)
• August Wilson's Ma Rainey's Black Bottom: 40th Broadway anniversary (11 October 1984)
• Equus: 50th Broadway anniversary (24 October 1974)
• Lady, Be Good!: 100th Broadway anniversary (1 December 1924)
• August Wilson's Gem of the Ocean: 20th Broadway anniversary (6 December 2004)
• Witness for the Prosecution: 70th Broadway anniversary (16 December 1954)

Authors

• Sarah Ruhl's 50th Birthday (24 January)
• Marvin Hamlisch's 80th Birthday (2 June)
• Cy Coleman's 95th Birthday (14 June)
• James Baldwin's 100th Birthday (2 August)
• George S. Kaufman's 135th Birthday (16 November)
• Lee Adams' 100th Birthday (2 December)
• Adolph Green's 110th Birthday (2 December)
• Noël Coward's 125th Birthday (16 December)

Shows

• The Wiz: 50th Broadway anniversary (5 January 1975)
• Smokey Joe's Cafe: 30th Broadway anniversary (2 March 1995)
• The Rocky Horror Show: 50th Broadway anniversary (10 March 1975)
• Arcadia: 30th Broadway anniversary (30 March 1995)
• The Glass Menagerie: 80th Broadway anniversary (31 March 1945)
• Bye Bye Birdie: 65th Broadway anniversary (14 April 1960)
• Rodgers & Hammerstein's Carousel: 80th Broadway anniversary (19 April 1945)
• Fun Home: 10th Broadway anniversary (19 April 2015)
• Chicago: 50th Broadway anniversary (3 June 1975)
• The 39 Steps: 20th premiere anniversary (17 June 2005)
• A Chorus Line: 50th Broadway anniversary (25 July 1975)
• Rodgers & Hammerstein's State Fair: 80th world premiere anniversary (29 August 1945)
• 42nd Street: 45th Broadway anniversary (25 August 1980)
• Ken Ludwig's Moon Over Buffalo: 30th Broadway anniversary (1 October 1995)
• Hay Fever: 100th Broadway anniversary (5 October 1925)
• Call Me Madam: 75th Broadway anniversary (12 October 1950)
• Man of La Mancha: 60th Broadway anniversary (22 November 1965)
• The Matchmaker: 70th Broadway anniversary (5 December 1955)
• The Cocoanuts: 100th Broadway anniversary (8 December 1925)
• A Charlie Brown Christmas: 60th anniversary of TV Premiere (9 December 1965)
• Nunsense: 40th off-Broadway anniversary (12 December 1985)

Authors

• Lorraine Hansberry's 95th Birthday (20 May)
• Larry Kramer's 90th Birthday (25 June)
• Oscar Hammerstein II's 130th Birthday (12 July)
• Jule Styne's 120th Birthday (31 December)

Shows

• Sweet Charity: 60th Broadway anniversary (29 January 1966)
• Rodgers & Hammerstein's The King and I: 75th Broadway anniversary (29 March 1951)
• Annie Get Your Gun: 80th Broadway anniversary (16 May 1946)
• For Colored Girls Who Have Considered Suicide / When the Rainbow Is Enuf: 50th Broadway anniversary (15 September 1976)
• The Clean House: 20th off-Broadway anniversary (29 October 2006)
• Oh, Kay!: 100th Broadway anniversary (8 November 1926)
• Natasha, Pierre & The Great Comet of 1812: 10th Broadway anniversary (14 November 2016)
• Cabaret: 60th Broadway anniversary (20 November 1966)

Authors

• Tennessee Williams' 115th Birthday (26 March)
• Samuel Beckett's 120th Birthday (13 April)
• Cole Porter's 135th Birthday (9 June)
• Jerry Herman's 95th Birthday (10 July)
• Eric Bentley's 110th Birthday (14 September)
• Ira Gershwin's 130th Birthday (6 December)

Shows

• The Homecoming: 60th Broadway anniversary (5 January 1967)
• Face the Music: 90th Broadway anniversary (17 February 1932)
• Crazy for You®: 35th Broadway anniversary (19 February 1992)
• The Deep Blue Sea: 75th London Premiere anniversary (6 March 1952)
• You're a Good Man, Charlie Brown: 60th Premiere anniversary (7 March 1967)
• Call Me Madam: 75th West End anniversary (15 March 1952)
• August Wilson's Fences: 40th Broadway anniversary (26 March 1987)
• Agnes of God: 45th Broadway anniversary (30 March 1982)
• The Wizard of Oz (MUNY Version): 85th Premiere anniversary (1 April 1942)
• Rosencrantz and Guildenstern Are Dead: 60th London Premiere anniversary (11 April 1967)
• Babes in Arms (Guare Version): 90th Broadway anniversary (14 April 1937)
• A Small Family Business: 35th Broadway anniversary (27 April 1992)
• Rodgers & Hammerstein's Oklahoma!: 75th West End anniversary (29 April 1947)
• Les Liaisons Dangereuses: 40th Broadway anniversary (30 April 1987)
• Nine: 45th Broadway anniversary (9 May 1982)
• Anything Goes (1962 Version): 65th Broadway anniversary (15 May 1962)
• Irving Berlin's Annie Get Your Gun: 80th West End anniversary (7 June 1947)
• Dreamgirls (Revival): 40th Broadway anniversary (28 June 1987)
• Pipeline: 10th Off-Broadway anniversary (10 July 2017)
• Time and the Conways: 90th West End anniversary (1 August 1937)
• Flare Path: 85th West End anniversary (13 August 1942)
• As You Like It (Taub): 10th Broadway anniversary (1 September 2017)
• A Brief History of Women: 10th World Premiere anniversary (5 September 2017)
• The Gin Game: 50th Broadway anniversary (6 October 1977)
• Rodgers & Hammerstein's Allegro: 80th Broadway anniversary (10 October 1947)
• Who's Afraid of Virginia Woolf?: 65th Broadway anniversary (13 October 1962)
• Dial 'M' for Murder: 75th Broadway anniversary (29 October 1952)
• Everybody's Talking About Jamie: West End Premiere 10th anniversary (6 November 2017)
• The Mousetrap: 75th West End anniversary (25 November 1952)
• A Streetcar Named Desire: 80th Broadway anniversary (3 December 1947)
• The Wizard of Oz (R.S.C. 1987): 40th anniversary (12 December 1987)
• The Sunshine Boys: 55th Broadway anniversary (20 December 1972)
• Show Boat: 100th Broadway anniversary (27 December 1927)

Authors

• John Kander's 100th Birthday (18 March)
• Thornton Wilder's 130th Birthday (17 April)
• Betty Comden's 110th Birthday (3 May)
• Richard Rodgers' 125th Birthday (28 June)
• Neil Simon's 100th Birthday (4 July)

Shows

• The 39 Steps: 20th Broadway anniversary (1 January 2008)
• The Prime of Miss Jean Brodie: 60th Broadway anniversary (16 January 1968)
• Our Town: 90th Broadway anniversary (4 February 1938)
• Plaza Suite: 60th Broadway anniversary! (14 February 1968)
• Dead Man's Cell Phone: 20th Off-Broadway anniversary (4 March 2008)
• In the Heights: 20th Broadway anniversary (9 March 2008)
• Cabaret: 30th Broadway revival anniversary (19 March 1998)
• Hands on a Hardbody: 15th Broadway anniversary (21 March 2013)
• God of Carnage: 20th West End premiere anniversary (25 March 2008)
• Rodgers & Hammerstein’s Oklahoma!: 85th Broadway anniversary (31 March 1943)
• Man of La Mancha: 60th West End anniversary (24 April 1968)
• Carrie: The Musical: 40th Broadway anniversary (12 May 1988)
• Runaways: 50th Broadway anniversary (13 May 1978)
• Torch Song Trilogy: 50th off-Broadway anniversary (22 May 1978)
• The Boys in the Band: 10th Broadway premiere anniversary (31 May 2018)
• First Date: 15th Broadway anniversary (8 August 2013)
• Calendar Girls: 20th premiere anniversary (5 September 2008)
• Witness for the Prosecution: 75th premiere anniversary (28 September 1953)
• The Pillowman: 25th West End premiere anniversary (13 November 2003)
• Footloose: 30th Broadway anniversary (22 November 1998)
• Irving Berlin's White Christmas: 20th Broadway anniversary (23 November 2008)
• Kiss Me, Kate: 80th Broadway anniversary (30 December 1948)

Authors

• Bertolt Brecht's 130th Birthday (10 February 1898)
• Edward Albee's 100th Birthday (12 March 1928)
• Fred Ebb's 100th Birthday (8 April 1928)
• Irving Berlin's 140th Birthday (11 May 1888)
• Charles Strouse's 100th Birthday (7 June 1928)
• Caryl Churchill's 90th Birthday (3 September 1938)
• George Gershwin's 130th Birthday (26 September 1898)
• Terrence McNally's 90th Birthday (3 November 1938)

Shows

• Hello, Dolly!: 65th Broadway anniversary (16 January 1964)
• SIX: 10th West End premiere anniversary (17 January 2019)
• Murder on the Nile: 85th premiere anniversary (17 January 1944)
• You're a Good Man, Charlie Brown (Revised): 30th Broadway anniversary (4 February 1999)
• They're Playing Our Song: 50th Broadway anniversary (11 February 1979)
• Cloud Nine: 50th premiere anniversary (14 February 1979)
• Shirley Valentine: 40th Broadway anniversary (16 February 1989)
• Ken Ludwig's Lend Me a Tenor: 40th Broadway anniversary (2 March 1989)
• Rodgers & Hammerstein's South Pacific: 80th premiere anniversary (7 March 1949)
• A Raisin in the Sun: 70th Broadway anniversary (11 March 1959)
• The Philadelphia Story: 90th Broadway anniversary (26 March 1939)
• Funny Girl: 65th Broadway anniversary (26 March 1964)
• Bedroom Farce: 50th Broadway anniversary (29 March 1979)
• Rodgers & Hammerstein's South Pacific: 80th Broadway anniversary (7 April 1949)
• Calendar Girls: 30th Original Calendar Release anniversary (12 April 1999)
• Hadestown: 10th Broadway anniversary (17 April 2019)
• The Elephant Man: 50th Broadway anniversary (17 April 1979)
• Big River: 40th Broadway anniversary (25 April 1985)
• A Strange Loop: 10th Off-Broadway anniversary (3 May 2019)
• Once Upon a Mattress: 70th Off-Broadway anniversary (11 May 1959)
• The History Boys: 25th London premiere anniversary (18 May 2004)
• Gypsy: 70th Broadway anniversary (21 May 1959)
• The SpongeBob Musical 30th anniversary year of Nickelodeon's SpongeBob SquarePants (June 1999)
• And Then There Were None: 85th Broadway anniversary (27 June 1944)
• Miss Liberty: 80th Broadway anniversary (15 July 1949)
• The Wizard of Oz: 90th Film Release anniversary (25 August 1939)
• The Clean House: 25th premiere anniversary (17 September 2004)
• The Sound of Music: 70th premiere anniversary (3 October 1959)
• August Wilson's Ma Rainey's Black Bottom: 45th Broadway anniversary (11 October 1984)
• Ken Ludwig's Leading Ladies: 25th premiere anniversary (15 October 2004)
• The Miracle Worker: 70th Broadway anniversary (19 October 1959)
• Butterflies Are Free: 60th Broadway anniversary (21 October 1969)
• The Habit of Art: 20th London premiere anniversary (5 November 2009)
• A Few Good Men: 40th Broadway anniversary (15 November 1989)
• In the Next Room or the vibrator play: 20th Broadway anniversary (19 November 2009)
• Cyrano de Bergerac (Crimp): 10th West End anniversary (27 November 2019)
• Marie Christine: 30th Broadway anniversary (2 December 1999)
• August Wilson's Gem of the Ocean: 20th Broadway anniversary (6 December 2004)
• The Ocean at the End of the Lane: 10th premiere anniversary (11 December 2019)
• Spider's Web: 75th West End anniversary (14 December 1954)
• Witness for the Prosecution: 75th Broadway anniversary (16 December 1954)
• Peter Pan: 125th premiere anniversary (27 December 1904)

Authors

• Alan Ayckbourn's 90th Birthday (12 April)
• Marvin Hamlisch's 85th Birthday (2 June)
• Cy Coleman's 100th Birthday (14 June)
• James Baldwin's 105th Birthday (2 August)
• Moss Hart's 125th Birthday (24 October)
• George S. Kaufman's 140th Birthday (16 November)
• Lee Adams' 105th Birthday (2 December)
• Adolph Green's 115th Birthday (2 December)
• Noël Coward's 130th Birthday (16 December)