You and The Doctor had gone to Planet-872 and were attending a ball hosted by the planet's government. Luckily, they were rather humanlike other than the language, but the TARDIS translates that in your mind perfectly fine. The Doctor was waiting at the bottom of the main staircase for you to come and join him in the ballroom after you had gone to quickly change into your suit

He walked back and forward, waiting for you to come down and muttering to himself. "Oh god..."