The idea of the Language Festival belongs to a US Esperanto speaker Dennis Keefe who initiated and organized the first Language Festival in 1995 in Tours, France. A report about the event was published in the international Esperanto magazine “Kontakto” and already the following year (1996) the first Russian Language Festival was held in Cheboksary in a similar way.
A mini language festival was successfully trialled in Sydney in May 2012. Watch little bits of it on Youtube Sydney mini-festival.