Primary and caucus voting was February - June of 2020
General election 11 - 3 - 2020
The debate schedule is here.
Below are links to candidate websites, Facebook, and twitter accounts

President
Vice President
President Candidates 2020

Presidential debates
Three Presidential debates were planned. The first debate was sponsored by the Cleveland Clinic and Case Western University and was held September 29th in Cleveland Ohio. Chris Wallace of Fox News was the moderator, and he chose the topics for each of the six fifteen minute segments of the debate.
The second debate on October 15th was cancelled after President Trump contracted Corona virus and refused to participate remotely.
The third debate happened at Belmont University in Nashville Tennessee on October 22, and Kristen Welker of NBC News was the moderator.
There was a single Vice Presidential debate between Kamala Harris and Mike Pence, and it was held on October 7th at the University of Utah, in Salt Lake City.
Click here for the official Commission on Presidential Debates website
Looking for an unbiased description of the 20 former candidates? See what the progressive British newspaper The Guardian had to say about them. Click here