Does "avec eux" refer back to "réunions"? If so, shouldn't you use avec "elles"? Also, Je suis sûre qu'"elles" (meetups) pourront t'aider...
Freeform Writing Exercise B1
I think eux refers to the people at the meet-ups.
The réunion group would have needed to be all females to justify elles as the stressed pronoun.
This is not specified in the text as so, therefore eux is correct because masculine or mixed gender within the group would require that pronoun.
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