How is the use of the word masque in The Masque of the Red Death ironic?

Oh, dude, in "The Masque of the Red Death," the use of the Word "masque" is ironic because while it refers to a fancy costume party in the story, it also alludes to the masked figure of the Red Death that ultimately brings death to the revelers. It's like calling a party "The Dance of the Grim Reaper" - not exactly a fun time for everyone involved. So, yeah, it's ironic in a dark and twisted kinda way.