Q: Under which section can a specific order of unlawful assembly with weapon can be passed ?

Ans: Section 144 of IPC is charged against people who join the unlawful assembly with any object capable of being used as a weapon to cause death. Section 144 of CrPC is a procedure of law on how to control the movement of the mass gathering that causing the nuisance to peace and tranquility of the public. 

Criminal Procedure Code (CrPC) of 1973 authorises the Executive Magistrate of any state or territory to issue an order to prohibit the assembly of four or more people in an area. According to the law, every member of such 'unlawful assembly' can be booked for engaging in rioting.