Question: How many impromptu locations did Paul McCartney go to promote his fourteenth solo album?

Context paragraphs:
Paul McCartney's Secret Tour 2007: The Secret Tour 2007 was a European & US impromptu tour of six "secret" shows in small venues by Paul McCartney scheduled to promote the release (just before the tour on 4 June 2007) of the "Memory Almost Full" studio album.

Life in a Paper Boat: Life in a Paper Boat is the fourteenth solo album by English folk singer Kate Rusby, released in October 2016.  The album, while featuring Rusby’s signature mix of traditional and original songs, marked a sonic departure from previous releases: synthesizers and drum programming were used extensively throughout the record.  Critics described the sonic change as "done in the best possible taste…. any initial surprise or shock soon wears off as you get accustomed to the gentle opulence of the soundscape” and “[giving] a modern context while retaining all the elements…[of] the folk tradition."  The album’s titular track, a Rusby composition, was inspired by the European migrant crisis.

Memory Almost Full: Memory Almost Full is the fourteenth solo studio album by Paul McCartney, discounting his Wings-and-Beatles-era discography, his orchestral works and his output as the Fireman.  It was released in the United Kingdom on 4 June 2007 and in the United States a day later.  The album was the first release on Starbucks' Hear Music label.  It was produced by David Kahne and recorded at Abbey Road Studios, Henson Recording Studios, AIR Studios, Hog Hill Mill Studios and RAK Studios between October 2003, and from 2006 to February 2007.  In between the 2003 and 2006 sessions, McCartney was working on another studio album, "Chaos and Creation in the Backyard" (2005), with producer Nigel Godrich.

Heroin (Z-Ro album): Heroin is the fourteenth solo album by Z-Ro.  Guests include Paul Wall, Chamillionaire, Billy Cook, Lil' Flip, Chris Ward, Mýa, and Mike D.

I Will Trust: I Will Trust is the fourteenth solo album from Contemporary Gospel singer Fred Hammond.  The album was released on November 17, 2014 through RCA Records.

Flaming Pie: Flaming Pie is the tenth solo studio album by Paul McCartney under his own name, first released in 1997.  His first studio album in over four years, it was mostly recorded following McCartney's involvement in the highly successful "Beatles Anthology" project.  The album was recorded in several locations over two years, 1995 and 1997, featuring two songs dating from 1992.  The album featured several of McCartney's family members and friends, most notably McCartney's son, James McCartney.  In "Flaming Pie"'s liner notes, McCartney said: ""[The Beatles Anthology]" reminded me of The Beatles' standards and the standards that we reached with the songs.  So in a way it was a refresher course that set the framework for this album."

When a Woman Loves (album): When a Woman Loves is the fourteenth solo album released by singer Patti LaBelle, her sixth ever on the MCA Records label.  The album was released on October 24, 2000.

Rite²: Rite² is an ambient music album by Julian Cope, released in 1997.  It is technically Cope’s fourteenth solo album, but is also the follow-up to the earlier album "Rite" (released in 1992 and credited to "Julian Cope & Donald Ross Skinner") and is the second in the "Rite" series.

Waterfalls (Paul McCartney song): "Waterfalls" is a Paul McCartney ballad from his first solo album after Wings, "McCartney II".  The song has a stripped-down sound, with McCartney only playing a Fender Rhodes electric piano and a synthesizer and singing, and a short solo most likely played on an acoustic guitar.  It was released as a single with "Check My Machine" as its B-Side and reached chart position #9 in the UK.  In the US, however, it was his first single ever to miss the "Billboard" Hot 100 chart, only reaching number 106 despite being the follow-up to the number one hit "Coming Up".  In 2013, "Rolling Stone" rated it the #25 all-time Paul McCartney post-Beatles song, describing how it contrasted with Wings' prior single.

McCartney (album): McCartney is the debut studio album by English musician Paul McCartney.  It was issued on Apple Records in April 1970 after McCartney had resisted attempts by his fellow Beatles to have the release delayed to allow for Apple's previously scheduled titles, notably the band's "Let It Be" album.  McCartney recorded this solo album during a period of depression and confusion, following John Lennon's private announcement on September 20, 1969 that he was leaving the Beatles, and the conflict over its release further estranged McCartney from his bandmates.  A press release in the form of a self-interview, supplied with UK promotional copies of "McCartney", led to the announcement of the group's break-up on 10 April 1970.

Supporting paragraphs: Paul McCartney's Secret Tour 2007 Memory Almost Full
Answer: six