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The SEC has rules for what constitutes legal and illegal insider trading: https://www.sec.gov/fast-answers/answersinsiderhtm.html

Generally though, the rules don't disallow average employees from guessing about the future stock price. It becomes illegal insider trading if somehow you had obtained material non-public information to make the decision.

The mere fact of meeting invite, standing alone (no other information that you had, innocuous subject line, etc), would be non-public, but would probably not be found to be material.

However, if you're the Equifax CSO and the CEO is never interested in your work, you might want to sell your shares as soon as they vest anyway.

I'm not a lawyer, but I expect that would depend on if you were aware of non-public information that could affect that decision.

Can you prove whether you guessed or knew something only an insider would have known?