Ushers are asked to greet people as they come into the Nave or the church prior to each Mass. This is an important act of welcoming and also makes ushers available to people who might have questions. In the case of holidays where attendance can be extraordinary, ushers may be called upon to help people find seats In the church. Ideally, the usher should not stand in a vestibule or walkway during Mass when seats are available. Ushers take up the collection during the offertory and then secure the collection. At the conclusion of Mass, as people have left the worship area. Ushers can make sure that the pews are in order and books and bulletins returned to their holders.