Marlene knows well enough that the best part of the party is when the boys wander back to their own home from the Leaky Cauldron (also, frankly, she's a single girl in wizarding London - the Leaky Cauldron feeds her more nights than not, and she could use a break). So she skips that part, and can be found flopped on the couch dressed in something, well, short. Someone, somewhere has given her a beer. Somewhere there's a pair of Quidditch tickets tucked where they aren't likely to be lost. Happy Birthday, Sirius. She'll probably remember to give them to you if you wander by.

Right now, though, she seems to have her feet propped up on the table where she might be admiring her shoes or might be contemplating where James has probably hidden the good whiskey. She gives whoever's next to her a sidelong look. "What's the likelihood that we're going to accidentally take out the entire house tonight, do you think?"

Look. It's Sirius Black's twenty-first birthday. She's just saying.