May 15, 1829 - While Joseph Smith, jun., and Oliver Cowdery were engaged in prayer in the woods, near Harmony, John the Baptist descended as a messenger from heaven in a cloud of light and ordained them to the Priesthood of Aaron and commanded them to baptize and ordain each other. This they did the same day. Immediately after being baptized, the Holy Ghost fell upon them in great measure and both prophesied. (See Doc. and Cov., Sec. 13, and History of Joseph Smith.)
May 6, 1832 - Joseph Smith, jun., Sidney Rigdon and Newel K. Whitney left Independence, Mo., for Ohio. On the journey Bro. Whitney broke his leg and was miraculously healed. Joseph was poisoned by his enemies, but was restored in an instant.
May 3, 1834 - At a conference of Elders, held at Kirtland, the Church was first named “The Church of Jesus Christ of Latter-day Saints.”
May 13, 1834 – Zion’s Camp continued traveling towards Missouri by traveling through a long range of beech woods where the roads were very bad. “In many instances we had to fasten ropes to the wagons to haul them out of the sloughs and mud holes. Brother Parley P. Pratt broke his harness; the brethren fastened their ropes to his wagon, and drew it about three miles to the place of encampment on the Scioto river, while he rode singing and whistling.” (HOC 2:65).
May 13, 1857 – Elder Parley P. Pratt is murdered in Arkansas and buried near the town of Alma. He was traveling through the southern and eastern states visiting the Saints and teaching the gospel. It is reported his dying words were: “I die a firm believer in the Gospel of Jesus Christ as revealed through the Prophet Joseph Smith…I am dying a martyr to the faith.” (Autobiography of Parley P. Pratt, xxvii)
May 1885 - Apostles Brigham Young and Moses Thatcher visited the City of Mexico, and obtained permission from the Federal government for the Saints to remain in Chihuahua.
Taken from: History of the Church; and Church Chronology by Andrew Jenson.