My proposed calendar which I think adequately combines heritage, economic and geographical requirements.
1. Melbourne, Australia
2. Shanghai, China
3. New Dehli, India
4. Barcelona, Spain shared with Valencia, Spain
5. Monte Carlo, Monaco
6. Zandvoort, Netherlands shared with Spielberg, Austria
7. Potrero de los Funes Circuit, Argentina
8. Montreal, Canada
9. Sochi, Russia
10. Paul Richard, France
11. Silverstone, Britian
12. Nurburgring, Germany shared with Hockenheim, Germany
13. Hungaroring, Hungary
14. Spa, Belgium
15. Monza, Italy
16. Marina Bay, Singapore
17. Suzuka, Japan
18. Yas Marina, Abu Dhabi
19. Austin, USA
20. Interlagos, Brazil