Supporters of both teams traditionally mix in and around the stadiums on matchdays,[9][10][11][12][13] somewhat unusually for a local derby, and take part in organised accompanying events such as a 'kalijera' (a supporters' parade from the city centre to the stadium)[6][15] and the 'Bertso-derbia', a singing and poetry contest between the two groups in the style of the traditional Bertsolaritza.[3][16][17][5] The fans have received praise for the relaxed atmosphere which usually accompanies the derby matches,[15] and although incidents have occurred within the stadia, the hostility is usually directed towards rival players[12] rather than fans.[3]