If you have an very picky group, try to have the adults who may have questions preview it. It all depends on what topics each person finds offensive. In the last half of the movie Indy (10 years old) meets Picasso, and he hangs out with 'ladies of the night' in a bar, and the entertainment is showgirls doing the can-can. You need to know your group - the artists were called 'bohemian' for a reason. I found nothing offensive, but the idea of a young boy hanging out with these people may offend some.
I found the section where he meets the artists particulary helpful while we were discussing the transition from Impressionism to Cubism. It taught while being entertaining.
I have to say I didn't show the first section, where he meets Roosevelt, to my son, because there was a lot of hunting and showing dead animals. That part would have disturbed my son. (It starts in Africa, then moves to paris)
The series is 12 or more episodes. I ordered the next one from netflix and plan to watch it sometime this weekend.
If you are concerned, I suggest you rent it and preview it, and then describe possible concerns with your group.