Reconstruct a question, answer pair from this explanation: To answer this question, we should know that: At 9: 00 on the morning of 13 April, the traditional festival of Baisakhi, Colonel Reginald Dyer, the acting military commander for Amritsar and its environs, proceeded through the city with several city officials, announcing the implementation of a pass system to enter or leave Amritsar, a curfew beginning at 20: 00 that night and a ban on all processions and public meetings of four or more persons.
Q:Context: At 9: 00 on the morning of 13 April, the traditional festival of Baisakhi, Colonel Reginald Dyer, the acting military commander for Amritsar and its environs, proceeded through the city with several city officials, announcing the implementation of a pass system to enter or leave Amritsar, a curfew beginning at 20: 00 that night and a ban on all processions and public meetings of four or more persons. The proclamation was read and explained in English, Urdu, Hindi and Punjabi, but few paid it any heed or appear to have learned of it later. Meanwhile, the local CID had received intelligence of the planned meeting in the Jallianwala Bagh through word of mouth and plainclothes detectives in the crowds. At 12: 40, Dyer was informed of the meeting and returned to his base at around 13: 30 to decide how to handle it.

Question: who banned all public meetings and procession in amritsar?
A:Colonel Reginald Dyer , the acting military commander for Amritsar and its environs