when you teach in Germany, the school organizes an event. you dress casual because you don't get any notifications. but when you arrive, you realize that everybody dresses formal. you are embarrassed. what would you do? if I was this teacher in this situation where somebody invited me to an event, but somehow I didn't hear or they didn't tell me about the dress code, and I ended up going under dressed. that would not be a very fun situation. so in the first place, I would sincerely apologize for not following the dress code to the activity's manager. taking responsibility for the situation is important to maintain Trust and open communication with the school colleagues. then, I would explain that I didn't get notification. and I didn't notice the local custom. so I made an honest mistake. third, I would suggest alternative ways to find an opportunity to try to change my outfit. if I had no time to go back, I would borrow one outfit from my colleague. and make sure I will never make similar mistakes again. last but not least, I would reflect on this incident and ensure I have a better understanding of School events. next time if I am invited, I would ask about the dress code in advance to prevent embarrassing things happen again.