Question: 2008 European Vacation Tour was a concert tour by American heavy metal band Metallica, an American heavy metal band based in San Rafael, in which U.S. State?

Context paragraphs:
2008 European Vacation Tour: 2008 European Vacation Tour was a concert tour by American heavy metal band Metallica.  The tour consisted of three separate European legs and a number of promotional and festival appearances in the United States held during summer 2008.

2012 European Black Album Tour: The 2012 European Black Album Tour (also called "The Metallica Vacation Tour 2012") was a concert tour of American heavy metal band Metallica.  The Black Album, which was released in August, 1991 was played entirely (in reverse order).  The band confirmed that the tour would be a celebration of the 20th anniversary of the album.  The tour headlined a few European festivals.

By Request Tour: The Metallica By Request Tour was a concert tour by American heavy metal band Metallica in support of their single "Lords of Summer", which was released on March 19, 2014.  An interactive tour, concertgoers could vote, via internet, which songs Metallica would include on each night's setlist and, at the concert, via SMS, to a song in the encore.  Metallica debuted a new song, called Lords of Summer.  Metallica's only stop in North America was in Montreal for the Heavy Montreal festival.

Lulu (Lou Reed and Metallica album): Lulu is a collaborative album between rock singer-songwriter Lou Reed and heavy metal band Metallica.  It was released on October 31, 2011 by Warner Bros. in the U.S. and Vertigo elsewhere.  The album is the final full-length studio recording project that Reed was involved in before his death in October 2013.  It was recorded in San Rafael, California, during April through June 2011, after Reed had played with Metallica at the Rock and Roll Hall of Fame's 25th Anniversary Concert which led to them wanting to collaborate.  The lead single, titled "The View", was released on September 27, 2011.

The Full Arsenal Tour: The Full Arsenal Tour was a 2012 concert tour by American heavy metal band Metallica.  Few of the shows were recorded for the band's movie , was the first tour that the band had two songs for the encore rather than three, and included stage antics like the stage falling apart, the Death Magnetic Coffins, and much more.

M2K Mini Tour: The M2K Tour was a mini tour by American heavy metal band Metallica.  The tour ran from late December 1999 to early January 2000.  During the tour, "Trapped Under Ice" was requested to be played when they were in Chicago by a fan.  The song was only played two other times: on November 17, 1984 in Belgium, and on November 18, 1984 in Paris.  Metallica also played the New Year's Eve show in Pontiac, Michigan at the Silverdome in front of 50,000 people.  At the show, Metallica broadcast the Times Square Ball Drop, ushering in the year 2000, and played the classic Kiss track "Detroit Rock City" alongside Ted Nugent, Kid Rock, and Sevendust.  The setlists for these tour dates, like their Sick of the Studio '07 tour, consisted of old songs and songs that they have not played in many years.

Gods of the Earth Tour: The "Gods of the Earth" Tour was a worldwide concert tour by American heavy metal band The Sword.  The tour, which was in support of the band's second album, "Gods of the Earth", began on March 23, 2008, ended on December 16, 2008 and included eighty-two shows played over six legs.  During the tour, and continuing after its conclusion, The Sword have been supporting heavy metal veterans Metallica on their European Vacation and World Magnetic tours.

WorldWired Tour: The WorldWired Tour is a current concert tour by American heavy metal band Metallica in support of their tenth studio album "Hardwired... To Self-Destruct", which was released on November 18, 2016.  It is also their first worldwide tour after the World Magnetic Tour six years ago.

Sick of the Studio '07: Sick of the Studio '07 was a 2007 concert tour by American heavy metal band Metallica, which took place in Europe.  The first four concerts were in festivals and the last eight in stadiums.  The band held a tourname-competition among the fans and they personally chose the winning suggestion.  The band did not play the "New Song" but the "Other New Song", which they had played on the previous tour (Escape from the Studio '06), was played at the Bilbao BBK Live Festival The setlists of the tour were full of old songs.  In Lisbon, Metallica performed "...And Justice For All" for the first time since October 1989.

Metallica: Metallica is an American heavy metal band based in San Rafael, California.  The band was formed in 1981 in Los Angeles when vocalist/guitarist James Hetfield responded to an advertisement posted by drummer Lars Ulrich in a local newspaper.  Metallica's current lineup comprises founding members Hetfield and Ulrich, longtime lead guitarist Kirk Hammett, and bassist Robert Trujillo.  Guitarist Dave Mustaine (who went on to form Megadeth) and bassists Ron McGovney, Cliff Burton, and Jason Newsted are also former members of the band.

Supporting paragraphs: 2008 European Vacation Tour Metallica
Answer: California