The fourth general conference of the Church is held in Kirtland, Ohio. Two thousand persons attend. The previous day Joseph prophesied that "the man of sin" would be revealed. After many evil manifestations of the spirit of Satan descending upon one member after another, Joseph rebukes Satan and many wonderful spiritual manifestations are experienced (including Joseph prophesying that John the Revelator is among the ten tribes and Lyman Wight seeing a vision of the Son sitting on the right hand of the Father). Elders are ordained as high priests for the first time in this dispensation.
[Conkling, Christopher J., Joseph Smith Chronology; History of the Church of Jesus Christ of Latter-day Saints (7 volumes) 1:175-77.]