2013 GT4 European Trophy season Tags: Motorsport Season.The 2013 Avon GT4 European Trophy season was the 6th season of the GT4 European Cup. Trophy name was carried out only this season. The season was begin on 26 May at Silverstone and will finish on 13 October at Zandvoort after five race weekends. year 2013-01-01T00:00:00+02:00 Learn more... Loading...