Trixie's line of work is dangerous. But she's a careful showpony, and that's why she's only died a few dozen times in her career. She thinks this is normal.
Celestia finds herself sharing company and her booze stash with Luna's crazed split-personality, Nightmare-Moon. However, as the night wears on, she finds she may actually be able to tolerate the dark alicorn. Maybe even like her.
Wait! So Rarity's being impersonated by a changeling? And Twilight too? And... the rest of the Elements of Harmony? Okay. So what's the big deal again?