Giving lessons after the prayers in the mosques and before the adhan for Jumu`ah
Giving lessons after prayers is something that is permissible, and it comes under the heading of means that are permissible in principle. This is proven on the basis of the Sunnah and the practice on a large scale that has been ongoing since the best of generations. There is nothing wrong with giving a lesson before Jumu`ah so long as it does not distract the worshippers or take up too much space, especially if there is a need for that.
