The open-air marketplace of rome was known as

i believe its a forum

Explanation:

i think its a A forum because in latin form it mean "public place outdoors" the plural is fora;  a forum can be defined as a public square in a roman municipium, or in any civitas, it was a basically occupied for vending, foods, goods it was basically a marketplace that could be found along with the buildings used for shops and stores that were used for open stalls.

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yes i can of course like what is it gonna be about

i think they came to washington to protest