I will be around my husband's ex-wife for a day, any advice?

Anonymous
So, their daughter have an archery tournament, and so they need to be both there. This is my first time to be around her the whole day. We only waved at each other one time but haven't talked. We might sit beside each other the whole day watching their daughter. How should I handle this situation? I don't have to talk to her, right? Or initiate any conversation? I know it would be awkward. I haven't dealt with an ex-wife before. Please give me some advice. Thank you. By the way, she is 20 years older than me.
I will be around my husband's ex-wife for a day, any advice?
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