How should I invite random girls to party?

Me and my friends have been having sausage fest parties for about a couple months now, every weekend. We have had girlfriends, but nothing too serious. My plan is to go to the mall and ask a group of girls to come party with us. My plan is too ask them if they drink, wanna come party this weekend, and get numbers. We are a mixed group of guys, none of us are fat or ugly. How should I go about this?
How should I invite random girls to party?
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