[quote]A guard at the front checks for weapons, though it is concealed well enough they may let it pass, but that is a dangerous risk to take.[/quote]

You mean this?
The guards only let in people who have concealed weapons.  Meaning they can't find the weapons.  What guard would let in a guy with a sword? It's a royal ball, remember.  There's the princess in there.  It's the palace.  No weapons allowed.  Some have weapons but they are concealed well enough so the guards can't see. Why would a nobleman need a weapon as I said before? Unless he's a murderer or some of the sort.  Or at least has a good reason.
[@Shmektheshmuck]