Unless you don't know anyone there except for the hosts. It's always easier to let them introduce you to the first few people through the door while the atmosphere is still calm. From there, you already have an "in" with the rest of their friends that show up later.
Will have to disagree. It's even better when you only know the hosts to be late. Most people at a party don't know each other they are all getting to know each other. If you come in late.. some folks will already be looking for new people to talk to, and you'll essentially be "new kid in class".. aka someone new and exciting to talk to.
Unless you don't know anyone there except for the hosts. It's always easier to let them introduce you to the first few people through the door while the atmosphere is still calm. From there, you already have an "in" with the rest of their friends that show up later.