EventR Team can be customised to allow you to apply brand colours and imagery throughout the app. The theme is controlled by the ECH and is an Enterprise feature. Please note the app theme is applied at the team level, but the app icon and and store listing remains the same.

Theme Selection
Theme detail screen

Theme Selection is made in the app in Account->Settings->Theme. These override the organisation default.

Currently the organisation can only set one theme at a time, though you can have multiple themes defined.