What is a group, please analyze whether the square dancing mothers belong to the group

Square Dancing Aunties belong to the group, they are organized, led and disciplined group. Many retired old people organize themselves and elect a leader, who is responsible for all activities, that is, the leader. Then they elect a dancer to teach the dances. In this way the group is established. Dancing square dance is a delightful form of entertainment, to bring happiness to the retired elderly, I hope that the old people in the enjoyment of happiness at the same time, but also pay attention to the impact, try not to disturb the life and rest of others.