While the Free Trailers are in your calendar (generally about 14 days before they turn into a pumpkin), they will dance and play for you (without nudity) if you set up the parameters that you want them to do so. Also, as long as that box shows that you still have time left (if there's a minus sign in front of the number of days you have no time left), you may purchase the "Full Card" for only one ticket instead of the ususal price of two tickets. The Full Card is approximately somewhere between one million and one billion times better than the Free Trailer.

Any girl in the whole system can be purchased any time for two tickets - it's just the girls temporarily visiting you on your calendar who are on sale for half price. Yes, the Free Trailer is basically gone forever after those 14 days, but you are always sent a new Free Trailer every day.