How about, "We hang out at the market." Or meet.

In this context, "gather" is archeic in usage.

Why isn't "We meet at the market" accepted?

Wy do they gather at the market? I must know.

Duolingo... Bertemu = meet Why are you not asking this question here? No-one talks like this. The exercise doesn't make sense. Phil

Duolingo Indonesian always distinguishes "gather" from "meet" as though they were two different things, when in fact they are the same.