18) To leave a group conversation, just slowly step back and then step away. Don’t draw attention to your leaving or you’ll be pulled back in. It feels mildly weird to do this but it’s worth it.
19) Throughout the party, prioritize introducing people to each other and hosting the people who are new or shy, even at the cost of getting less time hanging out with your best friends yourself. Parties are a public service, and the guests will (hopefully) pay you back for this by inviting you to parties of their own.
#18 takes practice but is the right move.