forum / square / plaza

forum
(in ancient Rome) a public place where meetings were held

a place where people can exchange opinions and ideas on a particular issue; 
a meeting organized for this purpose


square
an open area in a town, usually with four sides, surrounded by buildings



plaza
Plaza is a Spanish word related to 'field' which describes an open urban public space, 
such as a city square.

a small shopping centre, sometimes also with offices






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