On the StreamLabs dashboard, a gear icon would be shown where the refresh icon currently shows. From that icon, the user could select to Delete the event. Above the event list would be a button to toggle seeing deleted events.
I recently had a few spats with offensive names on Twitch. I received a follow, which then showed up on my Latest Follower label on my SLOBS overlay, and I had trouble finding a quick, easy way to remedy it. I resolved it by having a friend unfollow and refollow.
A few days later, a similar event happened, this time as a donation using my StreamLabs link. I know donations have a separate area from regular events, so I checked there, and lo! A feature, as I described at the start of this suggestion, was present, working exactly like I wanted it to. My request is generated today based on that discovery.
Similar issues like this have been posted, but all seem quite old, so I thought it might be worth a refreshed submission and description. In theory, the feature could be grafted from the donations section into the event list section, but I'm no expert on coding things!