Some of my suggestions have been mentioned in various forms, so I will try to expand on them.
Personal connections. A huge part of my teaching philosophy is that students need to find ways to personally connect to the material and make their own meaning in order to successfully learn math, and that it is my job as an educator to guide them to that place of understanding. Hearing how different people with different backgrounds/interests/life experiences found meaning from my tasks and related them to their own lives gives me new ways of thinking about the tasks, which I can then use to help my students. And if there is a task that you can’t relate or connect to at all, or that feels really meaningless to you, I want to hear that, too.
Specifics and references. A few comments have touched on the benefits of learning from each other, but it is something I think is very important. All of us are at different points in our teacher education and have valuable insight whether it is something you learned in another course, something you’ve dealt with in your own classroom, etc. I appreciate any feedback where you can use specific examples from your personal experience or links to research or concepts you’ve studied that are relevant.
Feedback upon feedback. I think that some of the most meaningful learning experiences I have had have been the result of an open interactive dialogue. If someone leaves feedback to me that speaks to you in some way, please feel free to build upon that. Whether it’s agreement, disagreement, or just an additional viewpoint, that kind of collaborative feedback is something I find very valuable.