Table:
text: 1931 Grand Prix season
Non-championship Grands Prix
Non-championship Grands Prix
Name_ Circuit Date_ Winning_driver Winning_constructor Report
Eifelrennen Nürburgring 7 June Rudolf Caracciola Mercedes-Benz Report
Grand Prix de la Marne Reims 5 July Marcel Lehoux Bugatti Report
Circuit du Vaucluse Avignon 5 July Frédéric Toselli Bugatti Report
German Grand Prix Nürburgring 19 July Rudolf Caracciola Mercedes-Benz Report
Dieppe Grand Prix Dieppe 26 July Philippe Étancelin Alfa Romeo Report
Coppa Ciano Montenero 2 August Tazio Nuvolari Alfa Romeo Report
Avusrennen AVUS 2 August Rudolf Caracciola Mercedes-Benz Report
Circuit du Dauphiné Grenoble 2 August Philippe Étancelin Alfa Romeo Report
Grand Prix du Comminges Saint-Gaudens 16 August Philippe Étancelin Alfa Romeo Report
Coppa Acerbo Pescara 16 August Giuseppe Campari Alfa Romeo Report

Question: Tell me the date of the 1931 non-championship grand prix season for the Avus race for Rudolf Caracciola?