I run a small local Bitcoin meetup and there are some expenses with it, mostly buying pizza, which I buy using Lightning. I can get some company sponsor, but I think it would be more Bitcoiner-style if we pay it collectively, value4value style. I could just put up QR code with my BOLT12 re-usable invoice, but I would like for people to see transparently how much sats is in the fund and when I spend some on the pizza.
Is there a good solution for this? Any suggestions?