When does the Midnight Crew intermission takes place? It cannot be after Homestuck because Lord Jack exploded, Bec Noir's state is unknown and Robotic Jack got decapitated then exploded along with Lord Jack.

Somewhere between 612 Years after the Beta Trolls enter and the moment the Blue Universe dies. Slick and his gang are Exiles after all. Also we do know Bec Noir’s state- He recovered, went through the door at the end and was captured by Jane. Beyond that, we don’t know what he’s doing on Earth-C though, but either they put him in some sort of rehab plan thing to be less stabby, or he’s in prison.