Overview
To add a Trumba spud or event to an Inside U of I page, a custom Trumba "web part" has been added to SharePoint Online. This web part is available when editing a SharePoint Online site.
Add a web part as normal and select Trumba from the list. Then click on the "Edit properties" icon to add the embed code.

Add the embed code and select "Apply".

The "Learn More" link associated with the web page is: https://www.trumba.com/help/publish/pub_mod_sharepoint.aspx