Whenever you create a Badge or Points system, the Event is what makes that collectible claimable.
If there are no active Events, then no one can claim your Badge or Points. When you deploy an Event, you are defining your Sources and integrations that establish the criteria for claiming.
All active and historical Events are visible on each post by clicking the date in the top-right corner of the card. A list of Events will appear in a modal with an indicator showing what is active and what is not. If it is a Badge there can be only one active Event, but for Points you can have multiple. If you are the owner of the post then you will also have the ability to Start and End Events directly from this screen as well.
Creating an Event is part of the standard Badge creation process, but if you have an existing post of any type and want to start a new Event, here's what you need to do:
In the post creator at the top of the News Feed, toggle the status indicator from New to Existing. This will then allow you to search for and select an existing post that you have previously created and redeploy a new Event with a fresh set of Integration and Source criteria. If it is a Badge, the new Event will replace the previous (if active), but publishing a new Event for Points will simply create a new potential avenue for someone to claim.