As someone mentioned, there is plenty to do without getting fucked or fucking him. You know that you are at no risk if that is what you do (or at least you should no that). Have a good time and then when it is over maybe talk to him about seeing him BBing and what precautions he took for the film shoots. If he explains things and you are satisfied (and believe) his explanations then I think you can relax and go on to the next step. Of course, you can (must) still play safe and be at very minimal risk. There is no such thing as no risk except abstinence. So have a wonderful time and get that Xmas cheer.