The cost of living at the moment sucks, but everybody should be able to afford a night out listening to live music supporting a good cause. The £2 tickets will cover the costs of the venue hire & sound engineer, plus a little extra donated to Suicide Prevention.
Pay what you want/can beyond that. 100% of it goes to helping people find support when they need it most. If you can't afford to pay more, just know you're still helping a great cause, and you can enjoy a night of singing dancing and good vibes safe in that knowledge :)