Rogue of Heart

You have a feeling it’s going to be a long day.

put very simply, in Homestuck Plot Terms, 

Hiveswap is probably going to detail how Doc Scratch took over Alternia to set up Lord English’s designs (setting up conditions for the troll meteors to fall and be accepted like disowning current heiress so Feferi can exist/potentially encountering The HandMaid during later acts of the game/setting up glyb’golyb to be Feferi’s Lusus also probably happens as thats definitely not Trizza’s Lusus)

and Hauntswitch likely goes over in detail how the Condesce conquered Earth to set up Lord English’s designs (the cult that Jude is obsessed I’m almost 100% sure they are juggalos and Xefros does mention the Condesce offhandedly that she’s out conquering other worlds in a “Oh boy I am glad that she’s out there and we’re in here” kinda way/Condesce has association/control of horrorterror associated things/Juggalo dark carnival/ both could be the reasons for those black Voidy/Green Sunny Monsters to exist on Earth in the beginning of hiveswap)

that’s how they can happen and exist in the Homestuck universe, but still be only tangentially related, if not really super related to the plot of Homestuck itself, since both of those events are never really delved in/needed to be delved in to in order to understand Homestuck’s plot