Doesn’t need to be coded-up or complex.

Could just be a bot post or comment in the saloon that acts like a bounty. Then gets paid out to someone random each day to anyone that contributes.

Could also just be something manually created each day. With a ‘theme’ for each day of the month to encourage comments.

This movie serves as the foundation for the college I studied at. They even make new students watch Pay it Forward during their orientation week.