What are some good ways to keep myself cool?

It’s the middle of summer here, and I’ve got my first concert next weekend where I’ll be sitting in a crowd for 4-5 hours. Im expecting it to be very hot. Im 6 months pregnant, so my internal temperature is struggling to stay regulated. Im worried about how I’m going to get through the concert without getting heat exhaustion. What are some ways that I can keep myself cool without air conditioning? I’ll have water with me but that can only help so much.
What are some good ways to keep myself cool?
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