A.F.
By "come and go" party do you mean come bring a present then you can go? ;) That's how I would take it. I wouldn't spread it out throughout the day if I were you, Parties are exhausting as it is. I would have it outside or at a park so everyone is spreadout. We were living in an apt for my first two kids 1st bday and I rented the clubhouse at our rental office.