First Timer offer

Friday nights are historically low sellers for us. We're looking at creating a First Timer Friday's offer where patrons who are new to file would receive drastically discounted tickets on Friday evenings. We're thinking pricing rules for this offer and my thought was that we'd have to create a list manger list and have it constantly regenerating to figure out who our new to file patrons are.

Does anyone have other ideas on how we could do this WITHOUT having to rely on a constantly regenerating list?