Tour Conductor (TC) Credits
A Tour Conductor is the organizer of a group sailing together. Princess awards one Tour Conductor (TC) credit for every eight staterooms a group books, which can be used on a ninth stateroom.
1 TC = 8 staterooms
You can also use points to buy down the TC ratio to be 1:7, 1:6 or 1:5, which means your group could get one Tour Conductor credit for every 7 (1:7), 6 (1:6) or 5 (1:5) staterooms you book.
Note: A Celebration Group with a reduced TC ratio can earn a maximum of 12 TC credits.