Which important event immediately preceded the Jallianwala Bagh massacre?

The Jallianwala Bagh massacre occurred on April 13, 1919, in Amritsar, Punjab. The public meeting at the ground was organized to peacefully protest against the arbitrary arrest of nationalist leaders Dr. Saifuddin Kitchlew and Dr. Satyapal under the provisions of the newly enacted Anarchical and Revolutionary Crimes Act of 1919, popularly known as the Rowlatt Act. Thus, the Rowlatt Act enactment immediately preceded the massacre.