Sleepover birthday parties are the perfect place to have fun with your friends, do a bunch of fun activities, and to eat your favorite treats.You just have to make a few plans in advance to make sure your party goes off without a hitch.Once you invite all of the guests, decide what food to get and what games to play or what movies to watch, all you'll need to do is to wait for the guests to arrive.ake the invitations in such a way that it reflects your personality. 1  You can go on Microsoft Word to make them, or write them by hand. 2  On the invitations, include who the party is for, what day it is, what time it starts and ends, where your house is, and your phone number (RSVP).