The request is simple:

<get-all-events xmlns="urn:publicid:IDN+cde.berkeley.edu:examples:webservice:event:200403"/>

The response is a list of events:

<events xmlns="urn:publicid:IDN+cde.berkeley.edu:examples:webservice:event:200403">
<event xmlns="urn:publicid:IDN+cde.berkeley.edu:examples:schemas:event:200403" timestamp="1079122269643" start-date="sdfsdf" id="e1079122269651">
...
</event>
</events>