There are 6 or more bands under the name Sideshow:
These are photos from concerts where Sideshow played, so they may be of other bands that played the concert as well.
Riot Fest 2013 Sep 21 - 22, 2013 Denver, Colorado, United States Uploaded by Troy C
311 / Elysium Crossing / Cachexia / Sideshow / Ritual Device Dec 14, 1991 Omaha, Nebraska, United States Uploaded by J2 Tone