Google’s YouTube is teaming with Earth Day Network and the Global Poverty Project to live-stream the Global Citizen 2015 Earth Day event in Washington, D.C., on Saturday, which is set to feature performances from Usher, Fall Out Boy, No Doubt, Coldplay’s Chris Martin, Mary J. Blige, Train and My Morning Jacket.

The live-stream will begin April 18 at 11:45 a.m. ET and run until 7:30 p.m. ET, available on the Global Citizen YouTube channel. Following the event, the entire show will be available for on-demand viewing on the channel for 72 hours.

The free event, aimed at raising awareness of poverty and climate change, is slated to include appearances by U.N. Secretary General Ban Ki-moon, U.S. Sen. Chris Coons, will.i.am and Soledad O’Brien and others.

YouTube’s broadcast of event is not just a gesture of goodwill. The No. 1 Internet video site wants to underscore its live-programming capabilities as well as its brand as a music destination — note that YouTube live-streamed Coachella music fest opening weekend April 10-12, for the fifth year in a row.

In addition, YouTube will use the event to showcase two popular creators — Yousef Erakat (FouseyTUBE) and Matthew Santoro (MatthewSantoro) — who will host pre- and post-show programming on the broadcast and will make onstage appearances in D.C. Erakat is a Palestinian-American who produces parodies, vlogs, comedy sketches and pranks on his YouTube channel, which has 5.2 million subscribers. Santoro is a Canadian personality with 3.9 million YouTube fans specializing in videos about “amazing facts.”

“It’s important to me to share the Global Citizen message with my YouTube fans and together with them fight to end extreme poverty and mobilize real environmental change,” Erakat said in a statement.

The not-for-profit Earth Day Network organization works with thousands of partners in 192 countries to promote environmental issues. More than 1 billion people now participate in Earth Day activities each year, according to the group.