OK, so my band is/was supposed to play a gig on July 5. On Thursday this week two of our guys left the band leaving three of us to regroup. We contacted all the clubs with upcoming shows about not being able to play but the guy who we are playing for on July 5 is threatening legal action against. We did not sign anything but we have emails where we say we would play. There is no other contract in place. My question is, can he really sue us? What legal speak can I give him to get him off my back?