Two weeks in Paris next September

Hi!

I'm a swiss french speaking girl living in Rome and coming to Paris next September for work. I'll be busy during the day but would enjoy going out for a drink or doing some activities in the evening!

I've already been to Paris a few times and I've seen the most famous sightseeings (I guess so), could advise some "less turistic" activities/ things to see? A suburb to visit, a bar to go in, an exhibition etc?

Thank you so much for your help... and perhaps let's see in September!

PS : I currently speak french, english, german and italian.

sara