I was recently asked by the Climate Crisis Coalition about an exercise i've been using for many years to do critical reflection. It's an old favourite of mine and its simplicity belies the profound effects it can have on people. I call it Why? Why? Why? and it consists of simply posing a simple question and pounding it with a series of "Why's". You can download an activity description here:
Why? Why? Why? Sample Form (Word-22K)
I like to call this exercise "popular education for our inner two-year-old" - something all parents will understand. I like to use this exercise to start an event as it gives people the chance to consider why they are involved in the work they do and, presumably, why they are participating in the event they are a part of.
If you use it please let me know how it goes and i'm happy to share more tips about how to use it.