To be married in the temple, see above. Engaged couples meet with their bishop once a week until they are married, all couples are strongly urged to take a marriage preparation class at their local LDS institute (local college campuses almost always have one.) One must also get a marriage license applicable to the state or country one is residing in, and also make sure that the laws are complied with according to age (get consent where necessary), length of time between getting the marriage license and the marriage, etc.
We must also arrange to have two witnesses at the wedding/sealing ceremony in the temple (usually the father of the bride and the father of the groom). You must get a new temple recommend for the marriage. On the recommend is noted your baptismal date and that it is a recommed for a wedding. One must have been a member of the LDS church for a year.
If either the bride or groom has not received their endowments, then they must have those before they are married. That can be planned for the day of the wedding ceremony, or a week before. If the groom (and bride) have served LDS missions, then they already have their endowments, so the wedding ceremony would just take place. And before one goes to the temple, wards and/or stakes have temple preparation classes.
Freepers
1--Why would someone's parents not be allowed in the temple to witness their child's wedding?
2--How long is a marriage ceremony, and how many couples wed on the same day? Do they do wedding after wedding in one day?