Hmmm, the sling. "I think," Riku came back to the bed with some new, fresh clothing, "If you can go without it, that would be better. We can carry it with us," in someone's pocket, "Just incase. It has been healing well." Riku should know; he checked up on the Prince's injuries every morning.
Riku helped Sora the rest of the way out of his shirt and began redressing him in the one he'd picked out. "I have to admit, that terrifies me more than this get-together." It was the King, and it was their relationship. What was going to happen tonight? It could turn out to be a very big thing.
"Philip dropped our invitation by while you were asleep, if you would like to read it." So there was no reason to worry that they weren't invited afterall.