Prabasi - Past and Present! PRABASI is a non-profit socio-cultural organization of the Bengalis of the San Francisco Bay Area, founded in 1974. This is the largest and oldest organization of Bengalis and Bengali-loving people in Northern California. Our goals are broadly defined in our vision and mission statement. We have open communication with all our members. Prabasi also has an interesting history. To promote a feeling of togetherness, Prabasi is a membership based organization.