We developed an event registration system a few years ago that we could
share if it you're interested.  It's a Java web app and thus requires a Java
servlet container such as Tomcat.  We've never shared it before so I'm not
sure how much effort it would take for someone else to get it up and
running.  You can create events that have one or more occurrences.  It
allows for registration, registration caps, and waitlists.  Reminder email
notices can be sent automatically or manually.  Event maintainers can view
and manage registration lists, mark attendance, and add walk-ins.  A couple
of limitations it has are (1) the basic model is things like workshops that
begin and end on the same day -- it's not really designed for multi-day
events or conferences where people can register for different tracks, etc.,
and (2) while it can maintain waitlists, it does not automatically bump
people on the waitlist up to registered if a registered person cancels --
you have to do that manually.  Anyway, I imagine that there may be simpler
solutions out there but, if you don't mind running a Java web app and being
the first to try to install our home-grown solution elsewhere, I'll be glad
to talk with you further about this option.
--Jim Coble
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