This obviously isn’t possible to scale to larger communities, but for the tiny gaming community I host, I have occasionally custom created badges for users/groups of players who participated in a particular event. It’s been a small helpful motivator to get people to participate more, and serves as a fun reminder for the actual event.
Compared to the badges we hand out for event shenanegans, the system badges suddenly carry a lot less weight in that context. Someone in it just for the ‘easy’ system badges for bragging rights has less to boast about, and comes off as…
kind of like this.