Don't install ATEvent with the ploneintegration profile. This allows the
  integration with plone.app.contenttypes for Plone < 5 without installing
  ATEvent too. Also, merge the steps from the now obsolte
  ploneintegration:prepare profile into the default one.
  Please eventually update your metadata.xml files to also depend on the
  plone.app.event.at:default profile.
  Please note: The goal is to completly remove the ploneintegration profile.
  The only reason of it's existance is that portlets cannot be registered for a
  specific browser layer.