I co-organized a mini-symposium at the SIAM Education conference, ED18. My own presentation was titled "Supporting Mathematics Students and Colleagues: Be An Active Bystander". Here is my abstract (slides are attached):
Many of us have been a witness to a microaggressions, or been on the receiving end of one, this in our departments, conferences and workshops, etc. We may wish we had stepped in at the time, or wish someone had stepped in for us. This talk is about being an "active bystander": what it is, what are the barriers for action, what are the potential benefits and pitfalls for all involved of being an active bystander, whether people might be trained to become better active bystanders, etc. As time permits, we will discuss a few hypothetical scenarios
For more info, see here.