A legendary football event in British secondary schools in which whole year groups
will play against each other. There is no limit on the number of players, the entire
school field is the pitch and the ball is constantly in play no matter what happens. All tactics are permitted. A typical El Classico
will see years 10 and 11 play against years 12 and 13 but other combinations are possible. Teachers
will often watch from the sidelines, fully aware that they cannot intervene in any way. Such is the El Classico's reputation they usually occur only once per year.