Organisation - December 17, 2009 Having a ball Picture Four student societies held a Christmas ball at Hotel de Wereld on 11 December. Tweet They were de Veetelers, Heeren XVII, Semper Florens and Dietri. Three hundred partygoers put on their glad rags to dance to the band Driven and play blackjack and roulette. Full of the Christmas spirit. Re:act Reaction Name* Please insert the sum of these numbers (use numbers): four + seven = *