Question:
The Four Tops are a vocal quartet from Detroit, Michigan, USA, who helped to define the city's Motown sound of the 1960s. The group's repertoire has included soul music, R&B, disco, adult contemporary, doo-wop, jazz, and show tunes. Founded as the Four Aims, lead singer Levi Stubbs, Abdul "Duke" Fakir, Renaldo "Obie" Benson and Lawrence Payton remained together for over four decades, performing from 1953 until 1997 without a change in personnel. The Four Tops were among a number of groups, including the Miracles, the Marvelettes, Martha and the Vandellas, the Temptations, and the Supremes, who established the Motown Sound heard around the world during the 1960s.
From the late 1980s, the Four Tops focused on touring and live performances. They recorded only one album, returning again to Motown for 1995's Christmas Here with You. On June 20, 1997, 59-year-old Lawrence Payton died as a result of liver cancer, after singing for 44 years with the Four Tops who, unlike many Motown groups, never had a single lineup change until then. At first, Levi Stubbs, Obie Benson, and Duke Fakir toured as a trio called The Tops. In 1998, they recruited former Temptation Theo Peoples to restore the group to a quartet. By the turn of the century, Stubbs had become ill from cancer; Ronnie McNeir was recruited to fill the Lawrence Payton position and Peoples stepped into Stubbs' shoes as lead singer. Stubbs later died on October 17, 2008 at his home in Detroit.  The group was featured in several television specials during this time, including Motown 45, and several by PBS, including a 50th anniversary concert dedicated to the group (available on DVD). The concert turned out to be bittersweet; it featured a brief appearance of the wheelchair-bound Levi Stubbs, and a memorial to Lawrence Payton, announced by Obie Benson. Benson appeared on one more PBS special and died on July 1, 2005, from lung cancer. The final PBS special, titled Motown: The Early Years, featured a message of Benson's passing following the credits. Lawrence Payton's son Roquel (real name Lawrence Payton, Jr.) replaced Benson as the new bass (Roquel could be seen in the pledge break interviews of Motown: The Early Years). Theo Peoples also left the Tops to form his own group and was replaced by Harold 'Spike' Bonhart as lead singer.  The group was inducted into the Rock and Roll Hall of Fame in 1990, and into the Vocal Group Hall of Fame in 1999. In 2004, Rolling Stone ranked them #79 on their list of the 100 Greatest Artists of All Time.
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What other events did they take part in?

Answer:
a 50th anniversary concert dedicated to the group (available on DVD). The concert turned out to be bittersweet;

Answer the question at the end by quoting:

Spacemen 3 were an English alternative rock band, formed in 1982 in Rugby, Warwickshire by Peter Kember and Jason Pierce. Their music is known for its brand of "minimalistic psychedelia". Spacemen 3 had their first independent chart hits in 1987, gaining a cult following, and going on to have greater success towards the end of the decade. However, they disbanded shortly afterwards, releasing their final studio album post-split in 1991 after an acrimonious parting of ways.
Most members of Spacemen 3 have continued to produce music and record either collaboratively or in solo projects. Peter Kember (alias 'Sonic Boom') has had a solo career releasing music under the monikers Spectrum and E.A.R., and has also done production work for MGMT, Panda Bear, Dean & Britta and The Flowers of Hell. Jason Pierce (alias 'J. Spaceman') remains the leader and creative force, and only constant member, of the alternative band Spiritualized who have achieved significant critical acclaim and commercial success. Both Kember and Pierce continue to perform some Spacemen 3 songs live (e.g. "Transparent Radiation", "Revolution", "Suicide", "Set Me Free", "Che" and "Let Me Down Gently" [Kember]; and "Take Me to the Other Side", "Walkin' with Jesus", "Amen" and "Lord Can You Hear Me?" [Pierce]).  Will Carruthers, Jonny Mattock and Mark Refoy formed Spiritualized with Pierce in early 1990. Carruthers left the band after the first album in 1992; followed by Mattock and Refoy in 1994. Refoy then fronted Slipstream who released two albums. Refoy played guitar for the Pet Shop Boys on their live tour in 2007. Will Carruthers took a hiatus from the music industry after leaving Spiritualized; but subsequently has worked with Kember, recorded two solo albums as Freelovebabies, and has most recently toured with The Brian Jonestown Massacre. Carruthers, Mattock and Refoy have also collaborated on projects together.  After leaving Spacemen 3 in 1988, both Pete Bain and Stewart Roswell ('Rosco') joined the neo-psychedelic band Darkside who released several albums. Following the end of Darkside, Bain formed 'Alphastone', and has assisted Kember on some of the latter's solo projects. As of 2010 he provides vocals and guitar in 'The Urgz'. Stewart Roswell (alias Sterling Roswell) released a solo album, The Psychedelic Ubik, in 2004.  In the early 1990s, early Spacemen 3 drummer Natty Brooker played bass under the alias 'Mr Ugly' in Garage rock band 'The Guaranteed Ugly', with Gavin Wissen. They released two albums. Brooker provided cover artwork for Spacemen 3's Recurring album and early Spiritualized releases. Brooker died of cancer on Friday 18 April 2014.

Where there any hits released?
"Transparent Radiation",