The Mystery Science Theater 3000 Live Riff-Along, a special streaming event [takes] place May 3 at 6 p.m. ET.
You can watch the special on MST3K’s Twitch and YouTube channels — the Twitch one is really good for MST3K fans, because it streams classic episodes 24/7.
(Joel will supposedly be on the show as well “to field questions and comments submitted to YouTube, Twitch, and Facebook.”)
The current MST3K cast includes Emily Marsh, Conor McGiffin, and Nate Begle, playing Emily Crenshaw, Tom Servo, and Crow T. Robot respectively.