FYI - the BMW website now has i3 test drive events up (across the country) -
https://www.bmwusa.com/secured/content/forms/BMWi3.aspx
If you click you can sign up (with or without an invite ID). In the Dallas area, they are the week of April 13th at the various dealers (Classic, BMW of Dallas, BMW of Arlington, Autobahn, etc.) - looks like each dealer will have the cars for ONE day and you sign up for one of the time slots (30 minutes apart) on a given day. In theory, I suppose you could sign up for more than one.