March 18, 1833 – Sidney Rigdon and Frederick G. Williams were appointed and set apart by President Joseph Smith to be his Counselors in the Presidency of the Church, according to the revelation given March 8th. On the same occasion “many of the brethren saw a heavenly vision of the Savior and concourses of angels.” (See History of Joseph Smith.)
March 20, 1839 – Joseph Smith, jun., who was still imprisoned in Liberty jail, Mo., wrote an excellent epistle “to the Saints at Quincy, Ill., and scattered abroad,” in which was embodied a most fervent prayer in behalf of the suffering Saints, and words of prophecy. (See Doc. and Cov., Sec. 121, and History of Joseph Smith.)
March 16, 1840 – Theodore Turley, a native of England, was jailed in Staffordshire while serving his mission in England. Turley allegedly still owed money in England due because of financial misdealings by his business partner. John Jones of Staffordshire, claimed to be one of his long-standing creditors but was also a bitter enemy of the Church. Jones got a warrant that landed Turley in jail where he stayed for two months. With no funds of his own, he could hardly have survived in jail without the help of the local Saints, who provided him with food and other necessities. Turley believed that it was fulfillment of a prophecy by Joseph Smith, who as they were leaving Nauvoo, said, “Keep up good courage, boys, some of you will look through the grates before you come back.”
March 17, 1842– The organization of the Female Relief Society of Nauvoo was commenced. It was completed on the 24th, with Emma Smith as president; Mrs. Elizabeth Ann Whitney and Mrs. Sarah M. Cleveland, counselors; Miss Elvira Cowles, treasurer; and Eliza R. Snow, secretary.
March 20, 1842 – The Prophet Joseph Smith baptized 80 people in the Mississippi River near his home, including M.L.D. Wasson, a nephew of Emma Smith, the first of her family to join the Church.
Taken from Andrew Jenson’s: Church Chronology