Court Influencer

Don't forget to open your inventory & use the Guest List Page so that the option appears to have a third guest.

Potential guests are:
Alexandros Mograine (Safe & Humble) - Maldraxxus- collect Ossein Staves & Battleaxes to turn in
Rendle & Cudgelface (Messy & Relaxing)- give Rendle a "sootible" hat, Fae Revel Masque/Red Noggin Candle/Crown of the Righteous/Pink Party Hat; Giving him one of each hat (once per week) will unlock the achievement Rendle's Big Day. They may be crafted or puchased off the auction house.
Polemarch Ardestes (Formal & Clean) - located at Hero's Rest in Bastion.
Hunt-Captain Korayn (Dangerous & Casual) - Ardenweald at Claw's edge, go south & kill mobs/destroy eggs.

Does anyone know the exact requirements to get this quest? I have two characters who are revered with the Ember Court, but only one has received it. Are there any prerequisite quests or upgrades to get this one?