You can add unlimited Custom Content to your Event. (But don't add too many; it won't look good.)
Your Attendees will see the Custom Content, previously called Custom Tabs, under the Event Settings webpage’s Custom Tabs tab.
Enable Custom Tabs in Event Settings
IMPORTANT TO KNOW: The Custom Tabs field acts like a master control, determining if Custom Content will be visible on an Event’s webpage or in the Navigator app.
Navigate to the Event Settings record.
Click the Pencil icon next to Custom Tabs.
Set Custom Tabs to “Always.”
Click Save.
Return to the related Event record and click Update.

Create a Custom Content Record
Click New next to the Custom Content Related List on your Event record.

Enter the relevant information.
Choose a value in the Display Location field.
Select “Webapp” to show on the Event’s webpage only.
Select “Navigator” to show in the Navigator app only.
Select “Both” to show on the Event’s webpage and in the Navigator app.
Click Save.

Can't find the Related List?
If you don't see the Custom Content Related List, edit the Event page layout and add the Custom Content object as a Related List.
View the Live Custom Tab
Perform a hard refresh on the Event webpage to will see the Custom Tab with your Custom Content!
Embedded Video
You can also add embedded videos as Custom Content.


Custom Content with an Iframe
When embedding a video in the Custom Tab (Custom Content) section, only domains whitelisted by Salesforce are supported. See the list here.
Use the steps below to create Custom Content records with iframed content.
Contact Blackthorn Support to confirm that your LMO has the Custom Content iframe enabled in the License Metadata.
Create a related Custom Content record for the Event.
Add the embed code in the Content field. See the example below.
Enter additional information as needed.
Click Save.
Open the related Event.
Click Update.
Example
For this example, we added content from YouTube and Spotify in the Content field.
YouTube: [embed src="https://www.youtube.com/embed/YpF6N-tL70Y?si=Njb9R8jfS0Mv0FEL" width="560" height="315" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen] [/embed]
Spotify: [embed src="https://open.spotify.com/embed/track/54flyrjcdnQdco7300avMJ?utm_source=generator" width="100%" height="352" title="Spotify audio player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen] [/embed]
