I don't know if this is an educated guess or just a guess but you can probably make a basic estimate. Say 30,000 tickets with an average ticket price of £100 gives you £3m in total revenue. The band probably get around 80% of that so that leaves about 600k left over. No idea what the costs of putting it on are but that has to come out of the 600k. However, all the food and drink sales would go to the club minus whatever those costs are obviously and I would assume they'll set higher prices than those at Boro games. I'd say it's likely to be less than £1m but that really is guesswork.