Jon Bon Jovi's publicist (Kristen Foster): 'This was a Runaway concert which means it is a smaller more intimate type acoustic show for the top levels of his fan club, so he is backed by on these by a group of musicians called the Kings Of Suburbia, not by "Bon Jovi" - and out of an abundance of caution they did not perform without Jon.'
There was a soundcheck: https://www.instagram.com/p/CVsyt8SL5aN/