Not to be overly negative, I think the above sounds like a good idea, but your biggest challenge will be to get BA to part with cash (assuming you are looking for money and not just a few flights for a raffle..).
For example, the very popular drink/beer/gin festivals that we have seen in lounges... Let’s just say that BA did not purchase those drinks and displays at cost... or purchase at all...
However, I wish you luck, and would be excited it it happens, but if you are looking for CASH from BA, you may have a tough time :-(