I am opening up a membership site to registration on September 23rd, however, content (or the real launch date of the site) will not be added until October 7th. So between September 23rd and October 7th, I want the people who register to get credit for their full month starting October 7th. Is it possible to have them sign up for membership and give them 2 weeks free? And then on October 7th, just change it so they register for a regular monthly subscription?