The 1967 calendar was a good calendar but this is what I would have done if I was in charge for F1.
2nd July
British Grand Prix
16th July
French Grand Prix
23rd July
Monaco Grand Prix
6th August
Belgian Grand Prix
13th August
Dutch Grand Prix
27th August
German Grand Prix
3rd September
Italian Grand Prix
17th September
Canadian Grand Prix
24th September
United States Grand Prix
8th October
Mexican Grand Prix
22nd October
South African Grand Prix