[Lucy Mack Smith] Joseph and Hyrum are reunited with their families at Quincy, Ill. (1)
-- April 25, 1839
[Joseph Smith] Quincy, Illinois. Joseph Smith went to Iowa with a committee of the Church to select a place for the relocation of the Saints from Missouri. (2)
-- 25 Apr. 1839
[Lucy Mack Smith] Joseph chooses Commerce and Montrose as the future gathering places for the Saints. (3)
-- 1839, April 26
Apostles (at great personal risk) gathered at Far West Temple site, to fulfill revelation regarding second apostolic mission to British Isles (D&C 118). (4)
-- 1839 26 April
Apostles gathered at Far West temple site in fulfillment of commandment respecting overseas mission (D&C 118). (5)
-- 1839 April 26
The Saints commenced evacuating Far West. April 22. Joseph Smith, Jun., arrived in Quincy, Illinois. (6)
Wilford Woodruff and George A. Smith are ordained apostles and members of the Quorum of the Twelve Apostles. (7)
-- 26 Apr. 1839
[Lucy Mack Smith] Members of the Twelve (Brigham Young, Heber C. Kimball, Orson Pratt, John E. Page, and John Taylor) meet in Far West, lay the cornerstone of the temple, and ordain Wilford Woodruff and George A. Smith apostles. (3)
-- April 26, 1839
[Quorum of the Twelve] Wilford Woodruff and George A. Smith ordained. (8)
-- 1839 April 26
[Wilford Woodruff] Ordained apostle by Brigham Young in Far West, Missouri (9)
-- 1839, April 26
[Wilford Woodruff] Ordained an Apostle by Brigham Young at the temple site in Far West, Missouri. (10)
-- 1839 April 30
[Joseph Smith] Church agents made initial purchases of land for Mormon settlement in Commerce, Illinois. (11)
-- During 1839 April
Saints decided to settle at Commerce (later Nauvoo), Illinois, and soon began purchasing land. (5)
Footnotes:
1 - History of Joseph Smith by His Mother: Revised and Enhanced by Scot Facer Proctor Maurine Jensen Proctor
2 - BYU Studies Journal, volume 46, no. 4: A Chronology of the Life of Joseph Smith
3 - Lucy's Book: A Critical Edition of Lucy Mack Smith's Family Memoir, Edited by Lavina Fielding Anderson, 2001, Signature Books
4 - Encyclopedia of Mormonism, Vol. 4, Appendix 2: A Chronology of Church History
5 - http://www.lds.net/forums/scripture-study-forum/12108-church-chronology-1800-2000-part-1-a.html#post214550
6 - Richards - Little, Compendium of the Doctrines of the Gospel, Church Chronology, Ch.66, p.306
7 - http://en.wikipedia.org/wiki/19th_century_(Mormonism)
8 - http://en.wikipedia.org/wiki/Chronology_of_the_Quorum_of_the_Twelve_Apostles_(LDS_Church)
9 - Wilford Woodruff's Journals 1833-1898: Typescript Edited by Scott G. Kenney, Signature Books, Midvale, Utah. Chronology
10 - Teachings of Presidents of the Church: Wilford Woodruff, The Church of Jesus Christ of Latter-day Saints, Salt Lake City, Utah
11 - Joseph Smith Papers: Chronology for the Years 1832-1839
Mormon History Timeline /Chronology
http://lds-church-history.blogspot.com/