Unappropriated behavior out of working hours

Dear team,
I want to kindly ask you for advice, how to handle situation , in which me employer (well known international company) start investigation about me, without my involvement, in case of unappropriated behavior during non working hours.

What's happened:
We had 3 days company conference, where I joined in the late evening in the bar with colleagues, bar were rent by company, no official event, no invitations, drinks payed by company. I met some colleagues, we drink a lot, dancing, and have a fun. Not all in the bar had the same crazy mood as we had...
Issue is that next days, somebody report my behavior as non appropriate to my supervisor and level about, and now company start investigation. My position is HR Senior Manager.I got information from my supervisor, that company doing investigation, and I have to wait for results.

It happened in Germany, my labour contract is in Slovakia.
It was happened out of working hours, night hours.

Could you please advice how can I protect myself, my good name and additional potential allegations?


Thank you very much in advance.

PS: And I'm sorry I'm not from US, I searching whole day about something else, but find only your page who can maybe help. If you are interested to help me, I'm from Europe, not America. Of course I'm willing to pay if needed.