a) Dereck Phelan decided to organise speed friending season because it poses problems for people looking for friends as adult and because he just moved away to Dublin from Kilkenny.
b) A session is organised by inviting your colleagues to exchange ideas in order to advance the field.
c) The bell is used for the people there to swap their partners.
d) Phelan usually comes to the session because he is the one that rings the bell.
C'est tout ce que j'avais compris dans le texte.
