The following sequence was used on a Sprint retrospective for a small team (5 people). It took less than one hour.

Activity 1: happiness radar

Based on the result of the happiness radar, I decided to focus the remaining of the retrospective on the areas with lower happiness. The post it colors were selected for each of the two identified areas (yellow for technology; gray for process)

Activity 2: small starfish

I did create the small starfish canvas (next to the happiness radar); I draw an arrow pointing to it and wrote the following sentence:
What will increase it?

Activity 3:  Group conversation and note taking