* συγκέντρωση (synkentrōsi): This is a good general word for a gathering, often implying a formal or organized assembly. It suggests a bringing together of people or things.
* συνάθροιση (synathroisi): This also means a gathering, but often implies a larger, possibly less organized assembly or crowd.
* πανηγύρι (panigýri): This refers to a festive gathering, a celebration, or a fair.
* σύναξη (synaxi): This word implies a coming together, often in a religious or spiritual context, like a church gathering.
The best choice depends on the context. If you can provide more information about the kind of gathering you're describing, I can help you choose the most appropriate word.