You can ask your players or people in the local community to donate prizes. Here’s a few options for prizes you can award to keep the costs low whilst still getting your players excited. Otherwise, you will be in breach of the law.
Remember any prizes you are offering on the night must be advertised ahead of time, and must not be dependent on the number of players that turn up on the night. However, as you likely don’t have a gambling licence and you’re trying to make money not spend it, then you should look to go down a different route. Traditionally, bingo winners are awarded cash prizes. Whilst your players will just play for fun and to donate to a good cause, having something nice to offer to the winners will add another layer of excitement!
The best way to draw players in to your bingo night is to offer attractive prizes.