The 2018 meeting
http://petkou.webpages.auth.gr/wordpress_4/
The 2019 meeting
http://petkou.webpages.auth.gr/Xmas2019/
The 2020 meeting
The 2018 meeting
http://petkou.webpages.auth.gr/wordpress_4/
The 2019 meeting
http://petkou.webpages.auth.gr/Xmas2019/
The 2020 meeting