Katey Wang - appears you are trying to build this using velocity scripting. Question back to you, what is your timing of the reminder emails? How often are you sending them out? Depending on this cadence you may be able to use tokens as well. Why don't you attend the user group meeting this week (SLC MUG May 16th Meeting - Marketo Marketing Summit Review and "Ah-ha" moments (or "Oh-no") ) that we discuss among all the other 'experts' to help you come up with a great solution. I know we can find the right solution for you. In the meantime, if anyone else wants to chime in, please do so.