Scenario
By default, when you create an event, it's marked as being in Draft Mode. If someone tries to access your summit page before you hit publish, they will see a Coming Soon page.
After creating your event, you now need to exit draft mode and publish it.
Quick start
Head to your event dashboard.
At the top right of the page, there's a drop-down labelled "Manage". Click that to reveal the options.
Select Publish Event to publish the event.
To un-publish (everything will go back to Draft Mode, attendees will see the Coming Soon page), click on the Un-publish Event option (which will only appear if the event is in a published state).