Is there a way to implement a notice that appears for a user after they have been registered for X number of days, but disappears after Y number of days? I'm trying to implement a marketing campaign whereby users who have been registered for 7 days, for example, receive an offer to join VIP at a discounted rate, but that special discount expires in 3 days (again, for example). Ideally, I would just have a notice that pops up for the user X number of days after registration and expires Y number of days after registration.