As long as you've got someone leading the army (except a merc commander) you should be getting the event as long as the enemy hasn't hidden.You can take courtiers too. You can also kill everyone at court, if you're so inclined. For everyone having problems with this, if you want the event to pop, lead your army yourself, or you don't get to pick afaik.
The very first invasion is supposed to be huge AFAIK.Meneth: I don't know if you have an opinion on this already, but I think Mongol balance needs work. In my Persia game, when the Ilkhanate attacked me, they got 100% warscore for Khiva and peaced automatically before I could even gather a stack. I doubt it would have mattered though, as they had 130,000 troops. I held all of Khiva, Persia, Mesopotamia, Armenia, al-Jazira and Arabia, and could not muster more than 100,000 including hiring every mercenary available.
If you hold the empire of Italia you can push dejure claims on them I think.How can I conquer Genoa, since you can't fabricate a claim on a merchant republic capital, and you can't get it de jure either since it's king-level ?
If you're a merchant republic, you can take the capital once that's their last holding and they've got no trade posts left (except for one in their capital).
If you're the Byzantines, Imperial Reconquest works.
If none of those are the case, then you shouldn't really be conquering Genoa.