As a scientist, I believe I can effectively communicate results obtained from research and experiments with colleagues and professors from the same field, but I find it hard to vehiculate these pieces of information with people from other fields. Some of the participants or enthusiasts of Tropentag are not scientists or natural scientists - and reporters work as tools to give a chance to the outer public to understand what is going on during the conference and to connect people that share the same interests.
Checking the website from the University I attend - University of Goettingen - I read the news that Tropentag was looking for student reporters. Fortunately I applied and was accepted into the team.