Sacrament meetings are usually held at the same time every week. Two or three congregations (termed wards for larger congregations or branches for smaller ones) may share a building.
The usual order of a Sacrament Meeting (the main worship service) is:
1) Welcome and announcements.
The Bishop usually presides over the meeting. It his responsibility to see that the service is conducted properly, and he will occasionally correct doctrinal or behavioral errors.
The person conducting the meeting is usually the Bishop or one of his two counselors. They typically rotate this duty on a month-by-month basis. He will welcome the congregation and often give announcements. He will usually announce the opening hymn and who is giving the opening prayer.
2) Opening Hymn. Usually by the congregation, occasionally a choir. There is typically a conductor who leads the singing, and there is usually at least one member who regularly plays the organ or piano. Hymnals are provided.
3) Opening prayer (Invocation). This is offered by a member of the congregation who has been invited to do so by the person conducting the meeting.
4) Ward Business. Conducted by a Bishopric member. Most of the activities in the church are performed by members who are called to positions with specific responsibilities. These are announced and presented to the congregation for a "sustaining vote", in which the members are asked if they are willing to sustain and approve this person in this calling, or oppose. (D&C 20:65) This vote is in practice nearly always unanimously affirmative but on occasion, opposition is expressed. When a person is released from a calling, the congregation is typically asked for a vote of thanks. Sometimes babies are blessed, (D&C 20:70) sometimes newly baptized members are confirmed (D&C 20:41), and the names of new members who have moved in and whose church membership records have been received are read and presented to the congregation for acceptance. At the close of ward business, if there is any, the Sacrament Hymn is announced.
5) Sacrament Hymn. Almost always by the congregation.
6) Administration of the Sacrament. This is the Lord's Supper. Bread and water are blessed by Priests, using the prayers given in D&C 20:77 and D&C 20:79, substituting "water" for "wine", and passed to the congregation, usually by the Deacons. If there are not sufficient numbers of Deacons or Priests, Elders may be asked for assistance.
7) Following the Sacrament, the conductor of the meeting will announce and sometime introduce the speakers. These are members of the congregation who have been asked to speak by the Bishop. These are the sermons. Occasionally, one of the Bishopric will give a sermon, but this is more often delegated.
7a) Intermediate Hymn. Typically by the congregation, between speakers, but if there is a ward choir, they may perform this. Sometimes another special musical number will be presented.
8) Conclusion. Announcement of the closing hymn and prayer.
9) Closing Hymn. As the opening Hymn. Usually by the congregation, occasionally a choir.
10) Closing prayer (Benediction). As the opening prayer.
There is not usually a communal bible or scripture reading, but the sermons in Sacrament meeting and the classes afterward use quotes from them liberally. There is no formal creed.
No collection is taken up. Tithes and offerings are usually placed in an envelope along with a donation slip and given to the Bishop or one of his counselors. Envelopes and donation slips are typically found outside the Bishop's office. There is also (recently) an online option for donations.
There is not usually a public confession of sins; most of this is done in private with the Bishop.
There is informal mingling before and after the Sacrament meeting, but usually not food or refreshments. These are typically reserved for social activities on weekdays or Saturdays.
On Fast Sunday, usually the first meeting of each month, there is a Fast and Testimony meeting, in which instead of appointed speakers or sermons, members are invited to share their own spiritual experiences and testimonies.