I think you'll be hard pushed to find someone who uses mpm-event in production, in most (if not all) the distros it's still classed as experimental see
http://httpd.apache.org/docs/2.2/mod/event.html most people use prefork or worker.
After a quick glance over the event page it appears you can use the same settings as prefork except you can keep keep alives on since they're passed off to a separate thread.
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