For some of the U. S. stamps of the last 60 years, FIRST DAY CEREMONY Souvenir Pages were privately produced as a competition to the USPS.  They are a significant component of comprehensive collection. A ceremony is usually held at the official first day city for every stamp and postal stationery item. The city is usually selected for its relationship to the stamp's subject or because a philatelic event is occurring there. People related to the stamp's subject are often invited to attend the ceremony along with political and postal officials.