When we are talking about role-plays, we are thinking of an authentic scenario where two people would have a conversation.
For IELTS, we are talking about what I would say is a 75% authentic situation, as we usually are engaging in more free thinking chats with people in daily conversations we have.
What we can do is think of some very popular role-plays and what elements we could use to help introduce our topic, get the grammar right, stay in focus and pronounce and stress words correctly, by taking some elements of these role plays and making them our own. Check out our presentation:
Role Plays or Other Free Practice Activities: http://bit.ly/2OCQF1a
Top 10 Role Plays For Your Speaking Class: http://bit.ly/2Shac8r