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.
Head to your event dashboard.
At the top right of the page, there's a drop-down labelled "Manage". Click that to see the options.
Select Publish Event to publish the event.
To un-publish (everything will go back to Draft Mode, and 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).
Important Things To Note:
To publish an event, you need to either be on a paid plan (not on trial) or, if you're on the free plan, ensure you've added a card to cover any applicable transaction fees.