Participants write down significant events and order them chronologically Source:
Divide into groups with 5 or less people each. Distribute cards and markers. Give participants 10min to note down memorable and / or personally significant events. It's about gathering many perspectives. Consensus would be detrimental. All participants post their cards and order them. It's okay to add cards on the fly. Analyze. Color Coding can help to see patterns, e.g.:
Hand out sticky notes and markers. Write the big problem you want to solve onto a note and stick it to the top of a wall or big board. Ask the participants to write down ideas of what they can do to solve the problem. Post them one level below the original problem. Repeat this for each note on the new level. For every idea ask whether it can be done in a single iteration and if everyone understands what they need to do. If the answer is no, break it down and create another level in the problem solving tree.
Once you have lower levels that are well understood and easy to implement in a single iteration, dot vote to decide which to tackle in the next iteration.
Let team members appreciate each other and end positively Source:
Agile Retrospectives who took it from 'The Satir Model: Family Therapy and Beyond'
Start by giving a sincere appreciation of one of the participants. It can be anything they contributed: help to the team or you, a solved problem, ...Then invite others and wait for someone to work up the nerve. Close, when no one has talked for a minute.