The Shearer Schoolhouse Revival--a series of meetings conducted in the summer of 1896 in Cherokee County, North Carolina, United States--was characterized by what participants believed to be the biblical experience of speaking in tongues. Many of the participants of these worship gatherings eventually organized into what is now known as the Church of God (Cleveland).
This event predated the Azusa Street Revival (1906), which is generally held to be the event that started the Pentecostal Movement in the United States. This suggests the Azusa Revival can be seen as one of several similar religious phenomena happening at the same time. There is no doubt, however, that Azusa had a greater "impact" and is more widely known.
http://www.churchofgod.org/about/a-brief-history-of-the-church-of-god