User blog comment:SayuriDarling/Full first chapter of The Mark of Athena/@comment-3415395-20120630082502/@comment-4515675-20120630171431

I don't think Calypso will be in MoA, RR said she will make an appearance in the HoO series but I think he hinted in the later books? Calypso is also a very mature person, I doubt she'd start drama for Percy and Annabeth.