Women in white dresses and men in dark suits walked to church through streets were unusually quiet on what is a national holiday of remembrance.
Memorial services were planned at a U.N. base and the site north of the capital where thousands of quake victims are buried. President Michel Martelly is attending Thursday's opening of a new university with former U.S. President Bill Clinton.
The government has said the disaster killed 316,000 people and displaced 1.5 million. More than 500,000 are still in temporary settlement camps.