Before I lead you into the palace (figuratively speaking), I need to emphasize the importance of good behavior.
Bad behavior can get you killed anywhere in the Three Lands, but in the Chara's palace it is also likely to get you tortured for days. This is because the highest penalty for crimes committed in the Chara's palace is death by torture - the so-called "Slave's Death." Although the previous Chara ordered the release of the empire's slaves, bringing to an end the torture of every palace slave condemned to death, traitors are still liable to this penalty.
The definition of "traitor" can be quite broad in the Chara's palace. I recommend that you not test its boundaries.
Some specific advice:
Be on your best behavior. Dress well, and learn the rules of courtesy toward Emorian noblemen and palace officials. When in doubt, bow. Address everyone you meet, whatever his age, as "sir" or by his title. You need not address the Chara by his full title, which is quite long; just "Chara" will do.
The wearing of arms is permitted by law in the Chara's palace if it is your custom in your homeland. However, if you choose to wear arms, you will find that every guard in the palace will leap upon you the moment you take the wrong turn in your path. Your life will be easier if you set aside your weapons during your visit. You are in no danger of being attacked yourself; the Chara's palace is the most heavily guarded building in the world, and visitors are free recipients of that guarding.
Also, be aware that the wearing of hidden weapons in the palace is considered a crime of treachery. Even I don't try to do this, unless I have made prior arrangements with the Chara.
[Translator's note: The Slave's Death is a tender topic for the Ambassador. Just why is explained in Blood Vow.]