Event Attendance

[graemef]

Is there any way to put a tracker url in an email for "Yes I will attend", "No I wont attend" etc for attendance to events. I want to use the campaign module for seminars we run and would like to be able to log responses for attendance rather than just opting out.
Has anyone done this before ?
Thanks
Graeme

[longreach]

If you want some ideas to check out, you can look at the Marketing Events module on our demo site. Seems pretty relevant to what you are trying to do.