There are, at least, two bands named Alpha & Omega.
These are photos from concerts where Alpha & Omega played, so they may be of other bands that played the concert as well.
For The Children 2014 Dec 13 - 14, 2014 Los Angeles, California, United States Uploaded by Felix Joel Garcia
Backtrack / Alpha & Omega / Take Offense / Downpresser / Violent Situation / God's Hate Jan 11, 2014 Pomona, California, United States Uploaded by Felix Joel Garcia