30 Aug 2011
17 Oct 2012
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I think you will have to organise your data with a single child type, as Sitefinity only supports a single child content type for any given parent content type.
Another way to do it might be not to have a hierarchy at all, but just create a field 'EventType' of type "Choices" and create "Basketball" and "Football" choices.
You could then create pages that list, edit and add only events of each type, and manage page permissions accordingly....