This girl, really pretty, is a common friend of my best friend and his brother. My best friend's brother knows her better than my buddy. But my buddy talks to her here and there as well. I have seen her, talked to her three/four times before last weekend, played coed with her too. But last weekend everything changed.
We started dancing together, and next thing you know we get close in our drunkeness and we kissed. We were drunk but not so drunk that we didn't know what we were doing. We had food together after and blah blah, we hugged and went our own way.

For some reason, i completely dropped the ball in getting her number. But I am not sweating that, cause I know I will see her again. One more piece of info, is her best friend likes my best friend.
So now I want to push the next encounter sooner than later..i know she has a wedding this weekend, so i have left it as it is for now. I am thinking of getting my buddy to invite those two out for few drinks and hang out next weekend (NOT THIS COMING WEEKEND).

I want to play it cool, and not msg her on fb or chase after her number and come off desperate or anything, trying to get her to come out this weekend.

I am in no rush, but is this something that is reasonable to do? something that will make me come off as not needy and cool in her eyes?

Why the hell not. Do it bro!

You da man.