Preceden currently does not support adding recurring events to your timeline, though this is something we'd like to add in the future.
We do offer a way to duplicate events though. To duplicate an event click on the event name. In the bottom, right hand corner of the window you will see the Duplicate Event link. Click on it and the duplicate event will automatically be added to your timeline.
If you're interested in a recurring event feature, we'd love to hear from you. Please drop us a note at firstname.lastname@example.org and we'll let you know when it's launched.