The work of Deacons involves a wide range of services for the church, including:
Assisting during Services and Meetings — Deacons are usually responsible for welcoming members and visitors as they enter the church and for assisting them, where necessary, to find seats. They also cooperate with the Pastor and Elders for smooth functioning of all meetings.
They are also responsible for visitation of members, the sick and shut-in, and also preparation for Baptismal Services. Assistance at Communion Service during the celebration of the ordinance of foot-washing, the deacons and deaconesses provide everything needed for this service, such as towels, basins, water, and buckets. After the service they see that the utensils and linen are washed and properly stored.
They care of the sick and aiding the poor and unfortunate. Deacons and deaconesses are charged with assisting the poor and unfortunate keeping the church informed of their needs and enlisting the support of church members.
In churches where the responsibility for the care and maintenance of church property is not assigned to a building committee, deacons and deaconesses have this responsibility
Text from: http://cambridgesda.net/deaconry/