Beginning as a small group of Members from Surrounding Mennonite Churches, Assembly broke from that congregation in the mid-1970s.
[1] The first Sunday school was organized at CMC in 1904, the first missionaries commissioned in late 1904 and 1905, and soon after began to support "home missions" in Chicago and Fort Wayne, Indiana.
The two congregations continued to collaborate on children's Sunday school for a time and had a combined youth group until 1986.
Weekly attendance ranges from 190 to 240 at Assembly, with 175 members participating in 20 small groups that meet 2-4 times each month.
[4] Rather than employing an individual to construct a narrative history of the congregation, Assembly invited certain members to write more thematically focused historical reflections, available on their website.