gangleri2001
Garbage day!!!
I think it's forum tabernarium because the adjective and the noun must agree. Or maybe you meant the tabern(s) of the forum, which should be taberna(e) fori. Or maybe you just meant the tavern, which should be either popina or taberna. But whatever you meant, one thing is sure: the current name, which translates as "the forum the tavern" is not completely wrong (it could also translate as "the forum tavern"), but sounds weird.