ESN's motto is "students helping students. It is run by students and every semester they have an introduction week; during that week they have a whole week of activities led by student volunteers as a way to introduce students to the city and student life. Many students participate and it is a great way to get to know fellow students. They also organize many events throughout the year, from pub quizzes to costume parties and comedy nights.
Curious about ESN? Take a quick look at the website.