When Eugene returns he explains, "Now, I'm all ways happy to 'ave a good minstrel. they're rare round these parts, too much of a taste for the good life, which this ain't. And you're welcome to ply your song here too for a couple nights but you best be careful. You sing something some Guard or snitch thinks is 'incendiary' then they're gonna send you to the stockade or shake you down for coin. And don't anger anyone you don't have to, if there's one thing you don't want in this town, its to get attention from the Guard."
"Now, if you promise me you can keep your 'eads down, then we're good, but if the Patrols come looking for you, you're just some wandering fool who took up 'ere a night for vittles." Eugene grabs another mug and begins to wash, "Now, let me give you a bit of the lay o' the land here, because you ain't gonna last to long if you don't know whats what 'ere. Now, I know I already said it but it bears repeating, avoid the City Guard. This ain't Vendhya, you cross the law you don't get a barrister and a trial, you bribe your way out or you go to the stockade until one of the Prince's decides they've got a use for you. The Princes are the government 'ere, such as it is, the City exists for their convenience, and as long as you don't up set things then they don't care what you do, or what the goons in the Guard do to you. Now you will have to pass through the Guard if you want to travel to another quarter, and if you're set on doing that the best advice I can give is pass quick, run or bribe but what ever you do, NEVER kill a City Guard. Thats a shitstorm no one wants. You kill a Guard and you won;t be welcome 'ere no more."
With a sigh Eugene answers your other question, "As for the Slaves, they are the life blood of Ix. There are five Slave Princes who run the Slave Trade, you want to buy a slave, you get it from them. They do auction off individual slaves at an outdoor auction once a week at the Gallows in the Merchant Quarter, but most are sold by the chain, fifty slaves to a chain or taken by caravan to other cities for sale. Now the Princes aren't ones to let their stock sit idle, so while the Slaves are waiting to be sold they till the fields outside the City walls or work the forges. Its brutal work and some die, but some would die sitting chained up in a warehouse all day too. The warehouse are massive brick buildings in the Military Quarter, you can't miss them there's probably a dozen of them scattered around the quarter."