How about, "We hang out at the market." Or meet.
Hang out will imply that after meeting, you will go somewhere and have a casual chat somewhere.
Meanwhile, 'berkumpul' means that the market is only the meeting point, they can shop together after that, rob some bank or whatever they planned to do
Why isn't "We meet at the market" accepted?
Wy do they gather at the market? I must know.
In this context, "gather" is archeic in usage.
Why "we gather at market" is not ok ... Y u need "the" u silly owl
"At market" sounds wrong in English, unless there's an idiom like that.