I recently ran a (small, comparatively) convention that had this same problem. The way we solved it was having multiple white boards and moveable stands that we could use to put signs around the venue. There was a big whiteboard and pin-up board at the reg desk which had maps, anti-harrassment policy, day's programme in large print, and other stuff. People seemed to find it useful.

And on some occasions we cheated and blu-tacked things to the doors anyway, but that's really not an option I'd advocate.

As an aside, what is this magical blue tape? Is it blu-tack?

- PharaohKatt