Nepali Congress (NC) Central Office Monday organised a tree plantation ceremony to mark the 26th remembrance day of the party's founding leader late BP Koirala. On the occasion, NC central leaders and party cadres planted diverse kinds of plants along the Bagmati river banks at Balkhu. The participants discussed the contribution of late Koirala in the Nepali politics. BP Koirala, who was the first democratically elected Prime Minister in Nepal's history, played an important role in the establishment of democracy in Nepal and the overthrow of the Rana regime, although he was not as successful against the Panchayat system.