The Civic subscriptions are not for specific performances of a production; they are set up as a fixed seat package of "dummy" performances and a patron exchanges those throughout the season for whichever performance dates they wish. I'm pretty sure they're not the only theatre that does this so I'm hoping someone can help me figure out which list criteria to use to find, say, 18-19 subscribers, because "Package History Season" leaves out anyone who exchanged all of their dummy performances. All help greatly appreciated!