I feel (a little) for the venue, but they do seem to be trying very hard and only managing to get it half-right. This is the problem when people who know basically naff-all about amplification get sold & told by a dealer. (no vested interest, of course - the amps are capable of making the neighbour think that the army has just started war games in their garden).
It really does need an experienced hand in here - I'm with everyone else, get in, play & go home.
Personally I'd not bother even considering a rebook (They'd hate me, I'm seriously loud....)