Dan Leno and the Limehouse Golem is a 1994 novel by the English author Peter Ackroyd.
 It is a murder mystery framed within a story featuring real historical characters, and set in a recreation of Victorian London.
The Main Point was a small coffeehouse venue on Lancaster Ave. in Bryn Mawr, Pennsylvania.
 The club was known for its small intimate atmosphere and low ticket prices.
 It hosted performers such as Phil Ochs, Livingston Taylor, Kate Taylor, James Taylor, Bruce Springsteen, David Bromberg, John Prine, Jimmy Buffett, The Persuasions, Allen Ginsberg, Bonnie Raitt, Jackson Browne, Billy Joel, The Stone Poneys with Linda Ronstadt, Dan Fogelberg, Jim Croce, Cat Stevens, Jonathan Edwards, John Denver, Steve Gillette, Tim Hardin, Deodato, Bill Withers, Arlo Guthrie, Don McLean, Joni Mitchell, Odetta, Blind Faith, Laura Nyro, Jimmy Webb, Sonny Terry and Brownie McGhee, Spencer Davis, Big Brother and the Holding Company, Emitt Rhodes, Jose Feliciano, Richie Havens, Randy Newman, Maynard Ferguson, Janis Ian, Mandrake Memorial, Elizabeth, Warren Zevon, Doc Watson, Edgar Winter, Loudon Wainwright III, Tom Rush, Tom Waits, Captain Beefheart and the Magic Band, Dave Van Ronk, John Mayall, Stevie Wonder, Leonard Cohen, Martin Mull and His Fabulous Furniture, Rick Nelson, Gordon Lightfoot, Tim Buckley, Luther Allison, The Strawbs, Ramblin' Jack Elliot, Len Chandler, Michael Cooney, John Pilla, Rick Von Schmidt, Eric Andersen, James Cotton, Merle Watson, Leon Redbone, and Tom Paxton, Savoy Brown,--as well as comedians George Carlin, Lily Tomlin, David Brenner, Cheech and Chong, Jay Leno, Uncle Dirty, and Franken and Davis (Al Franken and Tom Davis (comedian)) The Main Point also offered performances by classic folk, blues, bluegrass and country legends to younger audiences.
 Through the 1970s the Main Point was the place to hear local folk rock acts from the Delaware Valley area, including Alchemy, Wire & Wood and Daniels, Mason & McGowan.
Dan Leno (20 December 1860 – 31 October 1904) was an English comedian and stage actor of the Victorian and Edwardian eras, famous for performing in music hall.
 As a child, he was known for his clog dancing, and in his teen years, he became the star of his family's music hall act throughout Britain.
 He was an increasingly popular solo artist during the late 1880s and 1890s.
 He also performed in pantomimes and a few Victorian burlesques and comic plays and musicals, especially in the last two decades of his career.
English clog dancing began in 19th century England during the Industrial Revolution.
 It is thought to have developed in the Lancashire cotton mills where wooden-soled clogs were preferred to leather soles because the floors were kept wet to help keep the humidity high, important in cotton spinning.
 Workers sitting at the weaving machines wore hard-soled shoes, which they would tap to the rhythms of the machines to keep their feet warm.
 At their breaks and lunches, they would have competitions, where they were judged on the best rhythm patterns.
 By the late 1800s they clog-danced on proper stages at competitions.
 In these competitions, the judges would watch the routine and judge it according to footwork, precision, and technique.
 Clog dancers were a common sight at music halls throughout the 19th century and into the early 20th century.
 One such group was The Eight Lancashire Lads which included a young Charlie Chaplin as one of its members.
 Dan Leno became the world champion clog dancer in the 1880s, and records show that competitive clog dancing was a frequent occurrence throughout the 19th century.
Tom Leamore (24 August 1866 – 6 September 1939) was an English popular variety comedian, dancer and singer.
 He debuted at the Rodney Music Hall in 1880 and quickly grew into a successful stage performer, singing comically and dancing eccentrically with clogs.
 In December 1905 he portrayed Ali Baba in the pantomime of "The Forty Thieves" at the Marlborough Theatre, an experience he did not enjoy and never repeated.
 His best known song was "Percy from Pimlico" which he composed and wrote himself.
 He was featured singing this song in the 1968 documentary "A Little of What You Fancy".
 Tony Barker of "Music Hall Records" referred to him as "second only to Dan Leno".
Dan Leno (20 December 1860 – 31 October 1904) was an English comedian and stage actor, famous for appearing in music hall, comic plays, pantomimes, Victorian burlesques and musical comedies, during the Victorian and Edwardian eras.
 He originated and popularised many songs, sketches and monologues in his music hall acts and made both sound and visual recordings of some of his work shortly before he died.
 Although brief, Leno's recording period (1901–1903) produced around thirty recordings on one-sided shellac discs using the early acoustic recording process.
 They were released by the Gramophone and Typewriter Company, one of the early recording companies, which became the parent organisation for the His Master's Voice (HMV) label.
The Grand, is a Grade II listed building on St Johns Hill, Clapham Junction.
 It was designed by Earnest Woodrow and was first opened Monday 26 November 1900 as The New Grand Theatre of Varieties with a Music Hall production, featuring many well-known artistes of the time.
 When the Theatre opened it had a capacity of 3,000 and a stage 68' wide by 28' deep.
 The Theatre was built for a consortium which was led by the well-known Music Hall artistes Dan Leno, Herbert Campbell; Harry Randall; and Fred Williams.
 The Grand continued to be a successful Music Hall and Variety venue for 40 years.
 In 1927, the theatre was fitted for cinema use and was known as The Grand Theatre, as it still mainly staged variety shows.
 From 8 May 1950, The Grand went on to become a full-time cinema after it was purchased by the Essoldo Cinema chain and was renamed Essoldo Cinema.
 The Essoldo Cinema closed on 31 August 1963 and became the Essoldo Bingo Club on 11 October 1963 which was later taken over by Classic Cinemas who renamed it Vogue Bingo Club.
 During this time, they built a false ceiling, cutting off the upper parts of the theatre.
 From 1972 until 1979, Mecca Bingo took over as the final bingo operator.
George Wild Galvin (20 December 1860 – 31 October 1904), better known by the stage name Dan Leno, was a leading English music hall comedian and musical theatre actor during the late Victorian era.
 He was best known, aside from his music hall act, for his dame roles in the annual pantomimes that were popular at London's Theatre Royal, Drury Lane, from 1888 to 1904.
Harry Relph (21 July 1867 – 10 February 1928), professionally known as Little Tich, was a 4 ft tall English music hall comedian and dancer during the late 19th and early 20th centuries.
 He was best known for his acrobatic and comedic Big-Boot Dance, which he performed in Europe and for which he wore boots with soles 28 in long.
 Aside from his music hall appearances, he was also a popular performer in Christmas pantomimes and appeared in them annually at theatres throughout the English provinces.
 He repeated this success in London, where he appeared in three pantomimes at the Theatre Royal, Drury Lane between 1891 and 1893 alongside Dan Leno and Marie Lloyd.
The Limehouse Golem is a 2016 British horror-mystery film directed by Juan Carlos Medina from a screenplay by Jane Goldman.
 The film, an adaptation of Peter Ackroyd's 1994 murder mystery novel "Dan Leno and the Limehouse Golem", stars Olivia Cooke, Bill Nighy, and Douglas Booth.

Question: What do both Tom Leamore and Dan Leno have in common? 
Answer: comedian