The camels should be cured now. Give what the camel doctor needs.
Also in one of the dialogues, learn that the last slave trader now sell dates. This is the merchant by the palace gate.
Click on the tent or any active spots by the merchant by the palace gates. Talk to this merchant completely.
I am not sure if I have a saved game here. I have to look for them.
I sent you a saved game (3 files) but not sure if this is before getting the camels or after. Please check.