There are, at least, two groups by this name. Ballyhoo (without the exclamation mark!) is a South African group who had a huge hit in 1980 in their homeland with their single 'Man On The Moon'. This South African group is still going strong. The other group with the same name (but with the exclamation mark!) is from Maryland, USA, a modern rock/reggae party band, active since 2006.
These are videos from concerts where Ballyhoo! played, so they may be of other bands that played the concert as well.
Reggae Rise Up Florida 2021 Oct 21 - 24, 2021 St. Petersburg, Florida, United States Added by Joshua B.
Vans Warped Tour 2016 Jul 11, 2016 Scranton, Pennsylvania, United States Added by Ghost Leash
Vans Warped Tour 2016 Jun 29, 2016 Nashville, Tennessee, United States Added by Chris Scott 4211
Ballyhoo! / No Need Feb 26, 2016 St. Petersburg, Florida, United States Added by Joshua B.
Vans Warped Tour 2012 Jul 6, 2012 Auburn Hills, Michigan, United States Added by Cardi