Assalamu Alaikum.
Well, we sure did spend a lot of time on dawah – but it was still too little.
Here’s a wonderful e-book on this subject: Encouraging Harmony and Wisdom in Dawah and Warning from Discord by Shaikh Rabee ibn Hadee.
This is actually a transcript of a lecture that he gave. Here’s an audio (with translation) of one story in the book. Believe me, it’s hilarious!
Lecture Notes 