The Tour de France will be first of major three week races this year. It will start on August 29. While the Giro is scheduled to take place from October 3 and Vuelta will start on Oct 20. Giro d'Italia and Vuelta a España will overlap in October for few stages. And will be shortened to 18 stages and will finish in mid of November.
Another anticipated race will be Road World Championships from September 20th until September 27. The host will be Aigle-Martigny in Switzerland.

List of active 2020 cycling road races:
Oct 14
2020
Scheldeprijs
Competing teams: Mitchelton-Scott, INEOS Grenadiers, UAE Team Emirates, Deceuninck-QuickStep, Trek-Segafredo, Bora-Hansgrohe, Bahrain - McLaren, Lotto Soudal, Cofidis Solutions Credits, Team Sunweb, CCC Team, Groupama-FDJ
Oct 15
Oct 18
2020
Mercedes-Benz UCI Mountain Bike World Cup
Ziggo (Netherlands), SuperSport Africa (Africa)
Oct 18
2020
Tour of Flanders
Class: 1.UWT (ProTour)
Competing teams: Mitchelton-Scott, INEOS Grenadiers, Team Jumbo-Visma, UAE Team Emirates, Deceuninck-QuickStep, Trek-Segafredo, Bora-Hansgrohe, Bahrain - McLaren, EF Pro Cycling, Lotto Soudal, Cofidis Solutions Credits, Movistar Team
Oct 20
Nov 08
2020
Vuelta a Espana | Live today
#75 edition | First race: 1935
Class: 2.UWT (ProTour)
Competing teams: Mitchelton-Scott, INEOS Grenadiers, Team Jumbo-Visma, UAE Team Emirates, Deceuninck-QuickStep, Trek-Segafredo, Bora-Hansgrohe, Bahrain - McLaren, EF Pro Cycling, Lotto Soudal, Cofidis Solutions Credits, Movistar Team
Top riders: Valverde Alejandro, Mollema Bauke, Martin Dan, Costa Rui, Pinot Thibaut, Gesink Robert, Izagirre Ion, Roche Nicolas, Aru Fabio, Kruijswijk Steven
FloBikes (USA), NBCS Gold (USA), Olympic Channel (USA), SBS (Australia), DAZN (Austria), Een (Belgium), TV 2 Sport (Denmark), DAZN (Germany), DAZN Italia (Italy), J Sports 4 (Japan), NPO 1 (Netherlands), TV 2 Sport 2 (Norway), TV2 Sumo (Norway), DAZN España (Spain), Teledeporte (Spain), S4C (UK), SuperSport Africa (Africa), Eurosport Asia (Asia), Eurosport Europe (Europe), ESPN LatAm (South America)

Last race winners:
2019 Roglič Primož
2018 Yates Simon
2017 Froome Chris
2016 Quintana Nairo
2015 Aru Fabio
2014 Contador Alberto
2013 Horner Chris
2012 Contador Alberto
2011 Froome Chris
2010 Nibali Vincenzo
Oct 25
2020
Paris-Roubaix | Live today
Class: 1.UWT (ProTour)
Competing teams: Mitchelton-Scott, Team Jumbo-Visma, UAE Team Emirates, Deceuninck-QuickStep, Trek-Segafredo, Bora-Hansgrohe, Bahrain - McLaren, EF Pro Cycling, Lotto Soudal, Cofidis Solutions Credits, Movistar Team, AG2R La Mondiale