A lighter is a type of flat-bottomed barge used to transfer goods and passengers to and from moored ships. (https://en.wikipedia.org/wiki/Lighter_(barge))
The first World Forestry Congress was held in Rome in 1926 and has generally taken place every six years since then. Gatherings serve as a forum for governments, universities, civil society and the private sector to exchange views and experiences and to formulate recommendations for implementation at national, regional and global levels. The Congress also provides an opportunity for the sector to produce an overview of the state of forests and forestry in order to discern trends, adapt policies and raise awareness of issues among decision-makers, the public and other parties concerned. (http://www.fao.org/forestry/wfc/en/)