Circus is not allows in a same place, they are changing quite often the places, but nearby Dhaka like Savar, Aminbazar, Ashulia, Rampura these they normally perform, i have some contacts of them. when you arrive at Dhaka, then it might be a possible to let you know where they are performing on that time,
brick factory work they worker here don't really have any holidays, As bcz it a seasonal business that's why you can find them working at the day time 7 Days in a week. just outside of the city you will find hundreds of brick factories , take a taxi to Gaptoli, Savar, Ashulia, Aminbazar etc and find them working in the open air,