The Democratic Party will hold a presidential primary debate on October 15, 2019. It is the fourth of 12 Democratic primary debates scheduled for the 2020 presidential election . Candidates had until October 1, 2019, to qualify by reaching a grassroots fundraising threshold of 130,000 unique contributors and a polling threshold of 2 percent support or more in four eligible polls.

https://ballotpedia.org/Democratic_presidential_primary_debate_(October_15,_2019)