The Gessen girls infiltrate their middle school to get more info on Gekkou and Senkou.  This means cosplay, and outfits that are way too small.
It looks like a middle school
athletic tournament.
Das ist wohl das Leichtathletik-
Turnier der Mittelschule.
Parece un torneo deportivo
de secundaria.
Parece un torneo deportivo
de secundaria.
On dirait une rencontre sportive
de collégiennes.
Sembra un torneo di atletica delle medie...
Parece um torneio
atlético do fundamental...