You need to add a marker interface to both SiteRoot and ForumEvent, eg.
<class class="Class.Path.To.SiteRoot">
<implements interface=".interfaces.IMyMarkerInterface" />
</class>
<class class="Products.GroningerForum.content.ForumEvent">
<implements interface=".interfaces.IMyMarkerInterface" />
</class>
and then register the viewlet with for=".interfaces.IMyMarkerInterface".
I haven't done this but it should work.
Hedley Roos
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