I try to attend at least one science specific professional development event per year. Last year, I went to the McDonald Observatory in Texas to learn about telescopes and to gain new ideas about how to teach astronomy. This was a fantastic opportunity, I can’t recommend going (and living!) at an observatory with astronomers for a few days.
We started the workshop by creating climate posters in small groups. The student-directed groupings and mind mapping led to an open ended activity that could be beneficial at multiple points in any unit involving systems.