Participants can register in two stages. Early registration will be open until May 31, 2023 June 14, 2023, while late registration will be open from June 1, 2023 June 15, 2023.  We recommend early registration to benefit from a lower registration fee.

Participant type Early-bird (until May 31 June 14) Late (after May 31 June 14)
Student €490 €590
Academic €590 €690
Non-academic €690 €790

Please note: We charge a fixed flat fee for registration. If you wish to attend for less than two weeks, you will still be charged the same fee. The registration fee does not include lunches at the venue or accommodation, these are separate optional fees (see sections Venue and Accommodation).

ESSAI & ACAI 2023 Voucher

First European Summer School on Artificial Intelligence (ESSAI) and Twentieth Advanced Course on Artificial Intelligence (ACAI) will be organized in the same venue as ESSLLI 2023, during July 24-28, 2023. If you select this option, we will send you a 50 EUR voucher for the ESSAI and ACAI Summer Schools. You will receive voucher after your ESSLLI registration is paid. Note that cancelling ESSLLI registration will also cancel your voucher.

Visa information

Some participants from foreign countries may require a visa to enter Slovenia. Please note that Slovenia is a part of the Schengen Area. You are encouraged to apply for a visa as soon as possible. The time frames for visa processing are difficult to predict with accuracy for any individual applicant and could vary significantly depending on the country of residence of the applicant. You need to contact the Slovenian consulate in your country (or the consulate of another country that may handle visa applications for Slovenia) and enquire about the necessary documentation to be provided. As the school lasts fewer than 90 days, participants should get the C type visa. You can find more information about the visa application on this link

Letter of guarantee

If you need a Letter of Guarantee for your visa application, please contact us at the
The deadline to request a letter of guarantee is July 3.

Letter of invitation

If you need a letter of invitation or some other document for your visa application, you can request it over email at once your registration fee is paid.

Citizens of the Russian Federation

Due to complex and lengthy visa procedures we regret that we cannot provide guarantee and invitation letters to holders of Russian passports.