Summer Esperanto Study (Esperanto: Somera Esperanto-Studado, SES) is the biggest annual international event aiming to teach Esperanto. It occurs every summer since 2007, lasts for a week and attracts up to 250 participants from 30 countries, being aimed both at beginners and fluent speakers of the language. The event is organised by E@I and usually takes places in Slovakia, with the exception of 2014 when it also occurred in Russia. It has been supported several times by the Slovak ministry of education and the local mayor. In its first year, the event had a narrower focus and was called Slavic Esperanto Study (Esperanto: Slava Esperanto-Studado).