Welcoming the team and making them ready for «Name your Hero» comes naturally but still without making sure they’re in the right mood, you can never know. In order to do so, entering the retrospective present the team to a mood status chart. If you do not possess one it’s pretty simple. Ask them to draw an emoji or write something that describes their current mood and initials at the bottom. Ask if it is alright for everyone to go around the room and show the team what they wrote. If so, start yourself and have the next member do the same until everyone has shared their mood note.
It’s simple, to the point and even though there might be a few neutral notes, it helps on bringing up the mood for the whole room. After that, you can go on and present the agenda to the team, and if they agree to it you’re free to dive into the «Name your Hero» retrospective meeting.