Orchard Hotel like every other hotel in Singapore is guest friendly - Just be discrete and act like you own the place.
In some ways you are extremely lucky as Orchard Hotel is conviniently located near Orchard Towers or as we call it the Four Floor's of Whorres...
Drop me a PM closer to the time and I might be up for a beer or two...
For web info cheack out
http://www.sammyboy.com/
The forum is pretty good there as well.