I work in an office for an international company in the IT department. I work as a software engineer and our company has a bit of a reputation for being 'lax'. On Fridays, it is common that multiple team members including the team leader will go out for a pint of alcohol or two (nothing that gets them too drunk or tipsy) at lunch time. This will be done out of the office, during their allocated lunch hour, and will disturb no one who is staying in the office or finishes their lunch early.
In my office, we have my team and my team leader (who on this Friday was away for the day on annual leave). We also have some other teams, such as our network security team, and we have the director of IT and her assistant, whom can be thought of as 'above' my team leader in terms of rank.
This last Friday, the director of IT and her assistant were both drinking wine in the office to the point of inebriation; they were singing very raucously and distracting other people including myself. One man actually stormed out of the office because he was unable to work with the noise. Had I not had my headphones on, I would probably have done the same.
I would like to complain about this behaviour, but I'm unsure of who to go to. I fear that if I go to my team leader he will be wary of complaining about his superiors, and the heirarchy is not clear because I am unsure of the business structure outside of the director if IT (and how to get in contact with HR). I don't want to get the two in deep crap, I'd just rather let them know that I (or, rather, an anonymous employee) thought the conduct was inappropriate and unprofessional and distracted me (and others) from my duties, to the point where others left the office to work elsewhere.
What do I do?