E3 2021 is here! Make sure to check out the broadcast schedule below. Two more good sources to see what's going on during E3 2021 is on PC Gamer's post here and IGN's E3 page here.
Of course you'll want to keep an eye on the E3 streams on YouTube (https://www.youtube.com/e3) and Twitch (https://www.twitch.tv/e3).