Why have a Bible class or ministry meeting during Sunday School?

Why do assemblies have a Bible class or ministry meeting during Sunday School?

What better occupation could engage the parents of children in the Sunday School or the believers who have an interest in this work? If unbelievers come, what an opportunity to tell them the gospel! In the setting of the Sunday School, a Bible class can be more personal than the weekly Bible Reading and still be an effective way to teach the Scriptures. If the assembly chooses to use this time for a ministry meeting, could we think for one moment that such preaching of the Word is "out of season" (2 Timothy 4:2)? The more believers are exposed to "sound doctrine," the more spiritually healthy they become. Every assembly ought to provide ample opportunity for profitable ministry.

D. Oliver