CNN host Don Lemon announced that his network would hold another town hall marathon in October covering LGBT issues.

Lemon’s announcement followed a seven-hour town hall on climate change Wednesday involving 10 Democratic presidential candidates.

"CNN is partnering with the Human Rights Campaign Foundation for our next series of presidential town halls on issues that are important to the lesbian, gay, bisexual, transgender, and queer community," Lemon said after the climate change town hall with New Jersey Sen. Corey Booker.

The LGBT town hall series will be held at The Novo theater in Los Angeles on Oct. 10. To participate, CNN is requiring candidates to meet the same qualifications used by the Democratic National Committee for the Sept. 12 debate: receive 2% support in four qualifying national polls and amass donations from 130,000 donors. The candidates have until Sept. 25 to qualify.

So far, former Vice President Joe Biden, South Bend Mayor Pete Buttigieg, former Housing and Urban Development Secretary Julián Castro, California Sen. Kamala Harris, Minnesota Sen. Amy Klobuchar, and Massachusetts Sen. Elizabeth Warren are planning to participate in the event. New Jersey Sen. Corey Booker, former Texas Rep. Beto O'Rourke, Vermont Sen. Bernie Sanders, and former tech executive Andrew Yang have qualified but have not yet committed to attend, according to the HRC Foundation.

[Read more: Biden's eye fills with blood during CNN climate town hall]