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> Greta visited the US[...]

Yes, to address the United Nations.

...don’t forget the opportunistic appearance before Congress.

I was struggling with your use of "opportunistic". That word typically implies unethical behavior. Is that what you meant?

Had the opportunity to and acted on it. Parent mentioned UN, but she also visited other places in the US like the Congress.

You probably wanted the word “opportune” instead, then.