extracurricular activity (ECA) → εξωσχολική δραστηριότητα
extracurricular group activities → εξωσχολικές ομαδικές δραστηριότητες, ομαδικές εξωσχολικές δραστηριότητες
An extracurricular activity (ECA) or extra academic activity (EAA) is an activity, performed by students, that falls outside the realm of the normal curriculum of school, college or university education. Such activities are generally voluntary (as opposed to mandatory), social, philanthropic, and often involve others of the same age. Students and staff direct these activities under faculty sponsorship, although student-led initiatives, such as independent newspapers, are very common. However, sometimes the school principals and teachers also bring in these activities in the school among the students.
https://en.wikipedia.org/wiki/Extracurricular_activityar: أنشطة خارج المنهج; bn: সহশিক্ষা কার্যক্রম; ca: activitats extraescolars; en: extracurricular activity; id: ekstrakurikuler; ja: 課外活動; ko: 과외; ms: kokurikulum; nl: buitenschoolse activiteiten; pl: zajęcia pozalekcyjne; simple: extracurricular activity; uk: додаткова освіта дітей; zh: 課外活動