I am the tournament director of the 13x13 (July 31 + August 1 evenings), Lightning (July 27 + 28 evenings), 9x9 (July 23 + 24 evenings) tournaments. For 9x9, besides myself, so far there is 1 more referee. Please contact me at
jasiek@snafu.de if you attend the congress at the relevant days and would like to help as a referee in one or more of the side tournaments, especially 13x13 or lightning. If you have the nerves, you might play in a tournament and be a referee (interrupt your own games or arbitrate in between your games, as necessary). Of course, not playing and only refereeing is also possible.