Add Summary pages to event category (relval#13)
    
    As requested by @kparal in
    https://pagure.io/fedora-qa/relval/issue/13 , this adds Summary
    pages (going forward, existing ones won't be changed) to the
    category for the event. I was a bit worried this might break
    something non-obvious, but I looked around in all the places I
    can think of and couldn't find anything, so let's give it a go.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>