Like left his room, taking the devilish shape of his host he calmly strolled down the stairs and entered the lobby holding a rolled up poster under his arm.

In a way that made sure to draw as much attention to himself as possible he hung the poster on the wall in the lobby, then rung a large copper bell. The bell hadn't been there before, like copied it from the stables, but no one would notice. Probably.

"Everyone can I have your attention please!" His voice echoed loudly throughout the Hotel.
He grinned in a way only Lord De Gravee could.
"In light of almost all of our guests being nocturnal we have some festivities planned for tonight!"
He gestured at the poster, which showed a picture of a large pile of gift-wrapped boxes and the text 
[h3][i]The Giftening.[/i][/h3]

"We'll have a large dance, with food and music from a surprise DJ! And many gifts!"
As he said the word Gifts he slapped the poster and immediately the pile of boxes came rolling out of the poster like a multicolored avalanche.
"There will also be a competition! You all get one [u]coin of favor[/u]."
A small golden coin appeared in everyone's palm, it had a cartoon drawing off their own face on one end, and a picture of a present on the other.
"Award this to the person who gives you the best gift tonight! You can bring your own gifts. If you have nothing to give, my very good friend Like has provided a pile of wondrous treasures to give away." He gestured at the mountain of festive and mysterious packages next to him.
"Who-ever has the most coins at the end of the night will win a [u]special prize![/u]"

And with that he disappeared in a theatrical poof of smoke.