Question: Which festival did the English actor who played Archimedes in Monty Python achieve success at for The Frost Report?

Context articles: The Philosophers' Football Match
I've Got Two Legs
Ian MacNaughton
Lifeboat sketch
Never Be Rude to an Arab
Python Night – 30 Years of Monty Python
Another Monty Python Record
The Instant Monty Python CD Collection
Monty Python's Contractual Obligation Album
John Cleese

The Philosophers' Football Match is a Monty Python sketch depicting a football match in the Olympiastadion at the 1972 Munich Olympics between philosophers representing Greece and Germany.
 Starring in the sketch are Archimedes (John Cleese), Socrates (Eric Idle), Hegel (Graham Chapman), Nietzsche (Michael Palin), Marx (Terry Jones), and Kant (Terry Gilliam).
 Palin also provides the match television commentary.
"I've Got Two Legs" is a song by the British comedy troupe Monty Python that was composed by Terry Gilliam.
 It most prominently appears in the concert film "Monty Python Live at the Hollywood Bowl", the concert LP "Monty Python Live at Drury Lane" and the album "Monty Python Sings".
 It also appeared at the 2014 reunion shows in O2 Arena titled "Monty Python Live".
Edward Ian Macnaughton (30 December 1925 – 10 December 2002) was a Scottish actor-turned-television producer and director, best known for his work with the "Monty Python" team.
 MacNaughton was director and producer for all but four of the forty five episodes of "Monty Python's Flying Circus" from 1969 to 1974, director of the group's first feature film "And Now for Something Completely Different" in 1971 and director of their two German episodes, "Monty Python's Fliegender Zirkus" in 1971 and 1972.
 In 1973 the production team shared the BAFTA Award for Best Light Entertainment Programme for "Monty Python's Flying Circus".
Monty Python's Lifeboat (Cannibalism) sketch appeared on "Monty Python's Flying Circus" in .
 It was also performed on the album, "Another Monty Python Record", retitled "Still No Sign Of Land".
 The sketch was inspired by the famous 1884 English criminal law case of "R v Dudley and Stephens", which involved survival cannibalism among castaways after a shipwreck.
"Never Be Rude to an Arab" is a satirical song by the members of "Monty Python's Flying Circus", originally appearing on the 1980 album "Monty Python's Contractual Obligation Album".
 It appears as sung by Terry Jones in the theatrically released concert film "Monty Python Live at the Hollywood Bowl" and was included on the compilation album "Monty Python Sings".
Python Night was an evening of Monty Python related programmes broadcast on BBC2 on 9 October 1999, to celebrate the 30th anniversary of the first broadcast of "Monty Python's Flying Circus".
 It featured newly written sketches, three documentaries and a screening of "Monty Python's Life of Brian".
Another Monty Python Record is the second album produced by the Monty Python comedy group, released in 1971.
 Dissatisfied with their monaural BBC debut album the previous year, the group took full control of the follow-up, which would be the first release of a six-album deal with Charisma Records in the UK.
 Most of the material is from the second series of "Monty Python's Flying Circus", with only a few newly written pieces.
 One track, "Stake Your Claim", is an English language version of a sketch from the team's first German episode.
The Instant Monty Python CD Collection is a box set released in 1994 of six CDs containing eight albums by the Monty Python troupe.
 It does not include the first Monty Python record, "Monty Python's Flying Circus", whose rights are still owned by the BBC.
Monty Python's Contractual Obligation Album is the final studio album by Monty Python, released in 1980.
 As the title suggests, the album was put together to complete a contract with Charisma Records.
 Besides newly written songs and sketches, the sessions saw re-recordings of material that dated back to the 1960s pre-Python shows "I'm Sorry I'll Read That Again", "The Frost Report", "At Last The 1948 Show" and "How To Irritate People".
 One track, "Bells", dates from the sessions for "Monty Python's Previous Record", while further material was adapted from Eric Idle's post-Python series "Rutland Weekend Television".
 The group also reworked material written but discarded from early drafts of "Life Of Brian" as well as the initial scripts for what would eventually become "The Meaning Of Life".
John Marwood Cleese ( ; born 27 October 1939) is an English actor, voice actor, screenwriter, producer, and comedian.
 He achieved success at the Edinburgh Festival Fringe and as a scriptwriter and performer on "The Frost Report".
 In the late 1960s, he co-founded Monty Python, the comedy troupe responsible for the sketch show "Monty Python's Flying Circus" and the four Monty Python films: "And Now for Something Completely Different", "Monty Python and the Holy Grail", "Life of Brian" and "The Meaning of Life".