Hi Kelvin - I can't think of an "off the shelf" to do app that would have customized fields that would allow you to do that. Many apps have a start date and and due date that you could use as a kind of hack, work around. However, without know what tasks you have associated with each registration I think think just an XLS spreadsheet would be your best bet. That would keep all the registrations in one place. If you have tasks that are associated with those registrations you could create tasks in the todo manager that correspond with the dates of each registration and include a link to the XLS to make it easy to review. Good luck!