I will describe you how to do it in the backend.
Browse to the Event settings: Content --> EventsBackend --> Views --> EventsBackendEdit --> Toolbar --> Section and select the section you are working with (the custom one). Add the following CssClass "sfExpandableForm" and Title which is left blank by default. This way you will have the title for custom field.
As for the description - there is no description for sections - can you please clarify more about what description you need?
If you experience any more problems don't hesitate to contact me.
All the best,
the Telerik team
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