A good example of advertisements demonstrating and reinforcing rituals I can think of is the ad launched by China Mobile during the Chinese Spring Festival period.

Spring Festival is the most important ritual in China which represents the start of a brand new year. It is also the time for family reunions to share new year resolutions and new year blessings. So at that day, no matter how far you are away from home, you need to get back home before midnight or call back home to celebrate the coming year with all the family members.

This ritual of Spring Festival is neatly referred by China Mobile's ad. The ad is themed of full bars of signal as well as blessings. Choosing China Mobile (mobile phone service provider) enables you to send the first blessings to your family. This key message captures the common emotion needs of most people. It especially resonates with those people who are working or studying far away from home, like me. Because of the long distance, cell phone signal makes a big difference. And due to the heavy traffic of signals during Spring Festival, it is even harder to make phone calls home. So this ad successfully made the feature of strong signal attention-catching and memorable by demonstrating the great value audiences attach to the Spring Festival. In return, the ad also reinforce the importance of this special ritual among audiences.