You can set up a microsite on both pro and enterprise events, however, you need to purchase the microsite add-on for Pro events as it is not included in Pro events or Pro packages.
Once you go to edit the microsite you will be able to replace the Snappic branding with your own images and text.
If you need to customize the URL for the microsite, then you will need to purchase a white label for the event (white-label is an add-on only available for Enterprise events).