The rapper will perform a DJ set and host a "smoke session" online for cannabis lovers celebrating the special day, teaming up with marijuana technology company bosses at Weedmaps for "the world's biggest virtual 4/20 celebration" event.
The set will feature Wiz's "favourite tracks to smoke to" and celebrate the 4/20 Day release of his "The Saga of Wiz Khalifa EP".
In a statement, he said, "Super excited to hang with the Weedmaps smokers all over the world. I'm even more pumped to be able to share a new project on a holiday everyone loves."
The livestream, featuring an acoustic set by Billy during which he will debut his new single Hillbilly Ray, will be available via Weedmaps' website (https://weedmaps.com/420), from 3 P.M. EST on Monday.
Advising fans to smoke on their own to stop the spread of the COVID-19 virus, Cyrus added, "Be a Bogart. If you care, don't share. Don't pass your joint or pipe around, it's just not safe to do right now. Let's all take a breather, chill out on 4/20 and jam to some new music. We're gonna have a good time."
Also on the bill for the event are Stephen Marley, Cam'ron, Tycho, Dave East, Ari Lennox, Joey 'CoCo' Diaz, Berner, Alchemist, Tony Hinchcliffe, Chaunte Wayans, and Kitty Kash, with all artists collecting donations for Last Prisoners Project, a non-profit aimed at freeing the 40,000 Americans currently in jail for cannabis offences.
Another notable 4/20 Day livestream is Nightmares on Wax's 4/20 Special Instagram Live show (https://www.instagram.com/nightmaresonwax/), which will celebrate the 25th anniversary of his album Smokers Delight from 1 P.M. EST, with Dr. Dre's classic 1992 debut "The Chronic" also dropping on Apple Music on the famed marijuana holiday.