Here when one moves in a new home or starts to live in an own house the "tradition" is to pendre la crémaillère (have a house-warming party at the person's place).
Sorry but "Pendre la crémaillère" is FIRST a french tradition. <img src="/ubbthreads/images/graemlins/XmasJump.gif" alt="" />
The friends bring food and drinks but also presents for the new home like spoons, forks, dishes, pans, etc.