I am writing the Family History profiles of Joseph Smith Sr and Lucy Mack for the Familypedia project and am having trouble finding accurate information on the time and place of their marriage. I also can't find the name of their first child who died shortly after birth in 1797 (and the location also).
I also will note that a number of published sources (including MormonWiki) incorrectly state the Smith family moved to Tunbridge VT in 1802. This statement contradicts the birth records for Alvin Smith and Hyrum Smith who were born in Tunbridge in 1800 and 1802 respectively.