So you're willing to put up the cash to stage a concert yourself, Trojan? You'll need about £25k by the time all the bills are paid and there's no guarantee you will make your money back, let alone make a profit....
Dave R and I recently went quite a long way down this very path, and we concluded that;
1, The numbers really didn't stack up, (the risk outweighed the potential return)
2, There was too much resistance from Promoters and the Management companies of the acts that we were interested in.
It is never a good idea to persue a business venture where your 'partners' are reluctant.
In short, it was not a viable proposition, and we have turned our attention to more sensible investment opportunities.