Family and friends gather at the cemetery for a ceremony that can be performed by a minister, family member, friend, or neutral master of ceremonies. The burial can be for a casket or an urn; this can also serve as the conclusion of a funeral service or memorial service / celebration of life. (This ceremony is generally brief because of uncertainty of the weather.)
One of the biggest misconceptions about cremation is that there cannot be a funeral because of the cremation. Even with cremation many families will chose the comfort of having a funeral with the cremation taking place afterwards.
If the cremation takes place before the ceremony, the urn can be present along with meaningful or personal effects such as photos or memorabilia which could be displayed at the ceremony.
Following the ceremony the urn could be placed in a permanent spot such as a cemetery. Many cemeteries have different options. (I.e. Cremation section, rose gardens, or most full burial graves allow up to 4 urns to be buried in the existing plot.) Very often the family or friends like to be present when the urn is buried, this can act as a final closure to the life that was lived. Most cemeteries will allow a small memorial/marker to be placed on the grave.
The decision to scatter should be chosen carefully; it is an irreversible act. Very often there is no permanent record as to where the scattering has occurred and future generations have no site to visit. If the scattering takes place on private property, some day that property will be sold and family will not have access to that location. The emotional value of establishing a permanent site is worthy of consideration.