Yes! When creating an event, there is an option of toggling the "Publish" setting, which is what makes the event public-facing. Turning this off will not delete the event, but rather take it "offline" so that the event will be taken off the player and placed into a draft state where changes can be made to it.
Follow the steps below to unpublish an event on a player
- Navigate into Content > Players
- Hover over the player of your choice and select Events
- Scroll down to the timeline, select the event and toggle Publish to off