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That way, you can start the ball rolling with the invitation, and if you need guests to bring things for the theme, this can be included in the invitation. For example, if you do a girly award show theme make little awards and try to find a red carpet. Or, tell all of your guests to come in their girliest fanciest clothes. Even if you only have one guest coming you can still have some fun following these steps. It's a good idea to keep the group small, anything above six girls will become a bit rowdy and difficult for you to ensure everyone is having a good time. Plus, consider where everyone will fit for sleeping. Don't pass them out at school, people will get jealous. Send them through the mail. If that isn't possible, do it when people won't notice too much. Make sure you list anything they will have to bring, like sleeping bags, pillows, CDs, etc.    {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/49\/Have-a-Girly-Sleepover-Step-3.jpg\/v4-460px-Have-a-Girly-Sleepover-Step-3.jpg","bigUrl":"\/images\/thumb\/4\/49\/Have-a-Girly-Sleepover-Step-3.jpg\/aid303898-v4-728px-Have-a-Girly-Sleepover-Step-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"<div class=\"mw-parser-output\"><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/3.0\/\">Creative Commons<\/a><br>\n<\/p><p><br \/>\n<\/p><\/div>"}
Think of a theme first before you send invitations out. Make a guest list. Send out the invitations.