The Humanitas Citizens' Club was founded on November 4, 1872 and has a long history as a social club in Porsgrunn. The club offers a varied program for its members, including formal dinners with a dress code and informal club nights. In addition, they plan Saturday lunches that give members the opportunity to gather in a social setting.
The activities of the club include volunteer work and maintenance of the premises, which contributes to the community and the club's operations. Members can also participate in billiards games and competitions, such as the Humanitas Open. The club has a subgroup called Femina, which focuses on special events for female members. The Humanitas Citizens' Club thus has an important role in the local community, both as a social gathering point and through its involvement in various activities.