I know, this is something stupid to think about, but I keep hearing that you should pack comfy shoes. I'm having anxiety about what the bring, what to leave at home... So, my question is for those that have been to conference before. Should I bring like tennis shoes for walking and bring along a pair of nicer shoes in my bag every day? I'm famous for getting blisters, so I want to be comfy, but I also don't think my running shoes are going to look great with my nice outfits. Please shed some light...thanks!