Boston police arrested three people this weekend in connection with two separate violent events last week. Amanyeh Matra, 20, of Dorchester, was arrested Friday evening in connection with a shooting Monday on Hamilton Street in Dorchester. Police said the victim was transported to Brigham & Women's Hospital with gunshot wounds and is recovering. Two other men, William Mendoza, 22, of Revere, and Rafael Vasquez, 28, of Chelsea, were arrested in the stabbing of two other men on East Eagle Street in East Boston early yesterday morning. The victims were transported to Massachusetts General Hospital in critical condition.