Guys, What do you do to show someone the gal you're bringing is just a friend/colleague?

You're going to an event hosted by a gal you've been trying to impress and she gives you two free tickets for helping her out... You keep saying you don't have anyone to bring bc you want to be with HER... and finally cave, inviting your brother... and then (stalling till the day of) say "My friend [girl's name] too".

(I don't know why he stalled. It's just another gal. We needed to balance the attendance out so the event doesn't end up being a giant sausage fest...)

Your thoughts?

Guys, What do you do to show someone the gal you're bringing is just a friend/colleague?
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