If you want to delete your event, head to the dashboard by following this link: https://app.kululu.com/dashboard/.
Once you're there, you'll see your event name on the left. Look for the "View All" button just above the pink frame, and click on it. This will show you all the events you're the admin of. Find the event you want to delete, and look for the three dots in the corner of its frame. Click on the dots and select "Delete this event."
After that, just type "delete" when prompted, and then click on the delete button to confirm.