President of the Republic of Finland Tarja Halonen and doctor Pentti Arajärvi visited Vaasa on 13-14 September 2006, where they attended the 400th anniversary celebration of the City of Vaasa. During their visit, President Halonen and Doctor Arajärvi met King Carl XVI Gustaf and Queen Silvia of Sweden. The City of Vaasa hosted a banquet on Wednesday 13 September. On Thursday, the presidential couple and the royal couple visited the Åbo Akademi University's unit in Vaasa.