Athens police were yesterday bracing themselves for the possibility that they would have to step in tonight to prevent violence between ultra right-wingers and left-wing groups in the center of the city, where neo-Nazis from all over Europe are planning to hold a rally. A gathering of European extreme right-wingers had been organized by local group Chryssi Avgi (Golden Dawn) to take place in Greece this weekend at a campsite outside Athens, but it now seems these plans have been altered. Instead, far-rightists from several European countries, including Romania, Italy and Germany as well as Greece, are planning to meet at 6 p.m. outside the Chryssi Avgi offices in Exarchia, central Athens. Police are concerned that the group may then march toward the city center and be confronted by counter-demonstrators. Meanwhile, authorities in the Peloponnesian town of Meligalas are concerned extremists will gather there tomorrow for an annual commemoration of a 1944 battle between communist and right-wing forces.