Isso exatamente segue o meu xhtml:
<rich:dropDownMenu>
<f:facet name="label">
<h:panelGroup>
<h:outputText value="Cadastro/Consulta"/>
</h:panelGroup>
</f:facet>
<rich:menuGroup value="Evento">
<rich:menuItem submitMode="ajax" value="Evento US" action="ListarEventos"/>
</rich:menuGroup>
<rich:menuSeparator id="menuSeparator8">
<rich:componentControl for="panel" attachTo="link" operation="show" event="onclick"/>
</rich:menuSeparator>
<rich:menuItem submitMode="ajax" value="Logout"/>
</rich:dropDownMenu>
E meu faces-config:
<navigation-rule>
<from-view-id>/index.xhtml</from-view-id>
<navigation-case>
<from-outcome>ListarEventos</from-outcome>
<to-view-id>/listarEvento.xhtml</to-view-id>
</navigation-case>
</navigation-rule>