1. How do I Manage Hide/show Event page & Sponsor in Event Page
In WordPress Dashboard go to Appearance submenu and click on Customize.
After clicking on customize you will in theme Customizer.
Here you have to click on Page Template than Event Page
In Setting you can hide and show the Event & Sponsor in Event Page by clicking on hide/show button.
Go to Customize -> Page Template -> Event Page -> Setting
2. How to Create Event Page Template
Go to Dashboard -> Pages-> Add New Page -> Follow screen shot here.