Between 1820 and 1830 there are numerous 200th anniversaries connected to The Church of Jesus Christ of Latter-day Saints.  Although it wasn't formerly called that during this time period all the anniversaries are events leading up to it's official formation on 6th April 1830.

9th June 1830: The Church gather in Fayette, NY, to hold its first conference.  They accept the Articles and Covenants of the Church of Christ, now Doctrine and Covenants 20.

11th June 1829: Joseph smith deposits the title page of the Book of Mormon in the office of R. R. Lansing, clerk of the Northern District of New York, and obtains a copyright.

14th June 1828: Joseph Smith completes the translation of the Book of Lehi and allows Martin Harris to take the 116-page manuscript of the translation to show his family in Palmyra.  The manuscript is subsequently lost.

15th June 1828: Emma Smith gives birth to her and Joseph's first son, Alvin.  The child dies the same day.

26th June 1829: The title page of the Book of Mormon appears in print for the first time in the Wayne Sentinel, a paper published in Palmyra, NY. [Palmyra NY is in Wayne County.]

28th June 1830: Emma Smith, Joseph and Polly Knight, and twelve others are baptized in Colesville, NY.

1830: Samuel Smith, the first missionary to preach the gospel after the organization of the Church, begins his mission, selling copies of the Book of Mormon in several New York communities.

As found in On This Day In the Church: an illustrated almanac of the Latter-day Saints, Holzapfel, R.N., Baugh, A. L., Freeman, R.C., Hedges, A.H., Deseret Book Company, SLC, 2000.

1828 - Green Flake, later one of the three African-Americans to enter the Salt Lake Valley with the first company of Saints, is born on the Jordan Flake plantation in Anson County, North Carolina.  There are no known birth records for Hark Lay and Oscar Crosby, the two other African-Americans in the party.

1831 - In Fayette, NY, Joseph Smith receives Doctrine and Covenants 40, a revelation regarding the "fear of persecutions and the cares of the world" that cause some to reject the truth.

1831 - After the third conference of the Church Joseph Smith received D&C 39.  This revelation was for James Covill instructing him to be baptized.  Formerly, James Covill was a Baptist minister.

1841 - The Nauvoo Lyceum is established by Joseph Smith.  The first MTC, it was designed to be a theological school that would prepare missionaries for their service.

1842 - Joseph Smith opens the Red Brick Store in Nauvoo.  It served as Joseph's official office, but was also the site of the organization of Relief Society, and where the endowment was presented for the first time in this dispensation.

1831 - The Church purchases nearly sixty-four acres of the temple lot in Independence, Missouri from Jones H. Flournoy at a cost of $130.