There is a clown on the right, talk to him five times, you can learn the password and enter the black market.
If you want a normal plot: defeat the smugglers - orphanage - come to the casino - play a few times - go to the office to find Mrs. Lucky - go to the bar and talk to the witch to get the application for the witch academy - enter the orphanage, at this time it should trigger the church to save the captain plot, and then you can enter the sewers.