You shouldn't show up to someone's house too early.
Alex had been invited to a party at Nick's house at eight in the evening.
Alex wants to go to the party.
Alex shows up at Nick's house right after eight o'clock.
Alex shows up at Nick's house for the party at around six o'clock.
Nick opens the door and welcomes Alex into the house right as she arrives.
Nick isn't home when Alex arrives, and she has to wait outside for over an hour.