Rule 1: If you're running fashionably late, wear something interesting. A good rule of thumb is to dress like you're going to a rave, because that's exactly what this social gathering is.
Rule 2: When greeting your fellow latecomers, use the phrase 'Sorry I'm late, I was stuck in an existential crisis' to deflect any judgment.
Read on for more rules, if you dare
Or, if you're feeling particularly adventurous, try pushing the boundaries of acceptable tardiness