Let me break it down for you:
1. That is a cat on a 30th birthday invite. YES!!
2. Fancy dress DOES NOT mean cute cocktail dresses.
3. Fancy dress means
costumes.
4. Costumes??
5. Costumes + strangers??!!
6. Costumes + strangers + whiskey??!! Now you're talking...
7. Already looking forward to hangover migas.