During programs and at the end of a program do a retrospective. Bring everyone together and put a smiley (good things), meh face (not sure) and a frowny face (bad things) on a white board and list off things that went well, poorly, or unsure. Students and teachers can engage in this activity. It's a safe environment to provide critical feedback that focuses on how people felt vs. how they want to change things. It is part of an iterative process, gives students greater control of their environment, and helps them practice being self-reflective about what they just experienced.