The HELIMUN XII Annual Session will be held at Kulosaari Secondary School on May 3-4, 2012. The theme of the XII Annual Session is Democracy & Development.

The story of HELIMUN started in 2001 when a group of Kulosaari Upper Secondary School students participated in the Hague International Model United Nations (THIMUN). Two of these delegates, Ms. Aino Efraimsson and Ms. Milla Paalanen, got the idea of organising a MUN-conference to the 9th grade students at Kulosaari secondary School. The first MUN-conference, MINIMUN, was held in May 2001.

During the following years the MUN-conference, now known as KUMUN, expanded. In August 2004 the name of the conference was changed to Helsinki International Model United Nations (HELIMUN) to encourage also foreign schools to participate in the conference.