There are at least two bands called "BoomBox". Information about the Ukrainian band Boombox can be found under its name in Cyrillic: Бумбокс. This page is dedicated to BoomBox from the United States.
These are photos from concerts where Boombox played, so they may be of other bands that played the concert as well.
Electric Forest 2019 Jun 27 - 30, 2019 Rothbury, Michigan, United States Uploaded by Frankles