The party focused on exploring the Embassy. They have discovered that it is a portal to Sigil and they are the key holders.
Regild has encouraged the party to enter Sigil and assert their claim to the gate to give them bargaining power against the Empire. the Imperial Wizards will have sensed that the gate has been opened.
Wrathy and Elzin briefly explored the Embassy’s Sigil-side. They heard noises indicating some inhabitant on the upper floor above.