The Democratic Party’s first presidential debates ahead of the 2020 U.S. presidential election were held in two groups on June 26 and June 27, 2019, in Miami, Florida. Starting at 8:00 p.m. Eastern Standard Time, they aired on NBC and were broadcast on radio by Westwood One .
https://en.wikipedia.org/wiki/2020_Democratic_Party_presidential_debates_and_forums

