What is it? How can I sign up on chess.com
PogChamps is a series of online amateur chess tournaments hosted by Che****m. Players in the tournament are internet personalities, primarily Twitch streamers. PogChamps takes place over the course of two weeks. The first and second PogChamps had prize pools of $50,000 each, and the third iteration has a prize pool of $100,000.
(copied from Wiki)
You can not participate; you have to be invited to join.