Question: The Exchange performed as the opening act for the vocal group founded in 1993 in what city?

Context articles: List of Demi Lovato live performances
The Dells
Angels of Venice
Silver Girl Tour
Opening act
The Exchange (band)
Backstreet Boys
4 Runner
M-pact
The Platters

American singer Demi Lovato has embarked six concert tours and performed live at various award ceremonies and television shows.
 Her debut promotional tour in 2008, Demi Live!
 Warm Up Tour was based in North America only and supported her debut studio album, "Don't Forget" (2008).
 At the same year, Lovato served as one of the opening acts for Jonas Brothers on their fifth concert tour, Burnin' Up Tour.
 Lovato also served as one of the opening acts for Avril Lavigne on her third concert tour, The Best Damn World Tour on selected dates in North America.
 In 2009, Lovato performed as the opening act on the Jonas Brothers World Tour 2009 with Jonas Brothers during the South American and European legs, before she continued to tour her first headlining tour, during Summer 2009, promoting her debut album "Don't Forget" and her sophomore album "Here We Go Again".
 The tour featured opening acts, David Archuleta, Jordan Pruitt and KSM.
 In 2010, Lovato performed as the opening act on Jonas Brothers' Live in Concert World Tour 2010.
 On November 1, 2010, Lovato left the tour after a dispute arose to the public light involving her apparently punching one of the dancers of the tour.
 After Lovato left, she was interned in a treatment center to seek out help.
The Dells were an American R&B vocal group.
 Formed in high school in 1952 by founding members Marvin Junior, Verne Allison, Johnny Funches, Chuck Barksdale, and Mickey and Lucius McGill, under the name the El-Rays, they released their first recording in 1954, and two years later, had their first R&B hit with "Oh What a Night".
 After disbanding due to a near-fatal car crash in 1958, the band reformed in 1960 with Funches being replaced by Johnny Carter.
 This lineup remained together until Carter's 2009 death.
 The Dells were inducted to the Rock and Roll Hall of Fame and the Vocal Group Hall of Fame in 2004.
 The vocal group performed until illness forced longtime lead singer Marvin Junior and bass vocalist Chuck Barksdale into retirement, ending the group's 60-year run.
Angels Of Venice is a harp, cello, flute and vocal group founded by harpist Carol Tatum in 1993.
 The group's core sound is harp, flute and cello but also combines Middle Eastern, medieval and neoclassical styles.
The Silver Girl Tour was a 1986 concert tour by singer Donna Summer.
 This tour focused mainly on dates at regional casinos.
 Celebrity impressionist Louise DuArt served as the opening act.
 The shows were formatted to fit the then casino industry standard of 60 minutes for a headliner set, and 20 minutes for the opening act set.
An opening act, warm-up act, or supporting act is an entertainment act (musical, comedic, or otherwise), that performs at a concert before the featured act, or "headliner".
 Rarely, an opening act may perform again at the end of the event, or perform with the featured act after both have had a set to themselves.
The Exchange is an a cappella band from the United States founded in 2012 by Rochester, NY native Aaron Sperber.
 The group consists of Sperber, Alfredo Austin, Christopher Diaz, Jamal Moore, and Richard Steighner.
 The band was a finalist on Season 5 of NBC's musical reality television show "The Sing-Off" and also performed as the Backstreet Boys' opening act during the 2014 “In a World Like This” European tour.
The Backstreet Boys (often abbreviated as BSB) are an American vocal group, formed in Orlando, Florida in 1993.
 The group consists of AJ McLean, Howie D., Nick Carter, Kevin Richardson, and Brian Littrell.
4 Runner was an American country music vocal group founded in 1993 by lead singer Craig Morris, baritone Billy Crittenden, tenor Lee Hilliard, and bass Jim Chapman.
 Signed to Polydor Records Nashville, the quartet released its self-titled debut album in 1995, It featured four charting singles on Hot Country Songs, the most successful being "Cain's Blood" at No. 26.
 Billy Simon took Crittenden's place just before a second album for A&M Records, which was not released despite producing a chart single, and the band broke up afterward.
 Chapman, Hilliard, and Morris reunited with third baritone singer Michael Lusk to release its next album, "Getaway Car", on the Fresh label before disbanding a second time.
m-pact is a Los Angeles, California-based pop-jazz vocal group founded in June 1995.
 They are notable for winning the Los Angeles Music Award for Vocal Group of the Year; the 1999 "Billboard" magazine "Unsigned Band of the Year" award; earning an "Indie" (Independent "Grammy") nomination for their 1999 recording "The Carol Commission"; and receiving multiple nominations and awards in various categories of the Contemporary A Cappella Recording Awards (CARAs) and the A Cappella Community Awards (ACAs).
 The band has released 5 full-length albums, 3 EPs, 6 singles, and have been selected for inclusion on numerous compilations and "best-of" collections.
 A new full-length album is slated for release in spring 2018.
The Platters is an American vocal group.
 They were one of the most successful vocal groups of the early rock and roll era.
 Their distinctive sound was a bridge between the pre-rock Tin Pan Alley tradition and the burgeoning new genre.
 The act went through several personnel changes, with the most successful incarnation comprising lead tenor Tony Williams, David Lynch, Paul Robi, Herb Reed, and Zola Taylor.
 The group had 40 charting singles on the "Billboard" Hot 100 chart between 1955 and 1967, including four no. 1 hits.
 The Platters were one of the first African American groups to be accepted as a major chart group and were, for a period of time, the most successful vocal group in the world.