[umm a few days later?]
[Cross, not being one to spend much time in one place, doesn't get back to the room where he's officially listed as living until early on Day 76, and the last thing he's going to do is check the mail.]
[The invitation just sits, unattended, until long after the party is over. But he might still show up depending on how many pretty girls his Bikini Sense pings!]