In addition to the ideas above the group needs to have leadership, common purpose, and an awareness of the dynamics of a group. The two primary ways are through worship and prayer. Fellowship groups should worship together because Christians are made to worship. Worship helps to get things into a proper perspective. Worship unites the people of God around their God.
Worship is also refreshing to groups and individuals.
It sets our hearts on a different plain for a time that will make it easier to concentrate on spiritual matters. Bible study can be mere academics if we have no response to what we hear. Worshiping God together reminds us of our need to be obedient. We worship God because He is deserving of it. It lets us remember who the real leader of any Christian gathering is.