Unrecognized Calendar Events

I’ve recently had events from a calendar show up my iPhone calendar I don’t recognize. I’ve checked in my iCloud settings, the accounts in my mail settings, and in the added calendars section of settings with no luck. There’s no outside email address or phone number the events are linked to. The strangest thing is the events are at a church I’m aware of, I’m assuming a friend or acquaintance of mine who attends the church and has those events in my calendar somehow shared those events with me…? I just can’t figure out who it would be and I feel silly for not being able to figure out how. Any help would be greatly appreciated!