There’s a reason fall is the best season in New York, and it’s not just the weather. The July-August lull induces heightened levels of anxiety in the city’s residents, so by the time September and October roll around, things are crazy. There’s a fashion show, gallery opening, or cocktail party every night, which you either are or aren’t invited to, and people’s favorite topic of conversation is invariably how busy they are.

The hysteria culminates in the lead-up to Halloween, when people fly into the city in expensive outfits to attend expensive parties. Lavish events pop up in every direction, and those who wouldn’t usually attend them scramble for tickets with high and easily dashed expectations. Here’s a guide to who’s coming and who isn’t, and why.