The people who stay to clean up after the party usually get trusted with the next one.

Trust is handed out on the basis of the last hour, not the best hour. Everybody is helpful while the music is on, and the group still there when the room is a mess is very small, and the host notices every member of it. Staying is information about you that nobody can fake.

Be the one who starts stacking before being asked, and leave only when the kitchen looks like it did at eight. You will be invited to the next thing, and eventually you will be asked to run something. It is the cheapest reputation available.