Tonks and [open]
How Tonks had let her boss convince her to do this, she had no idea. Formal occasions weren't her thing, but with all of the recent activity, there was no denying that this ball had the potential to be a huge Death Eater target. With such a large portion of the wizarding population there, it made the need for tight security even more important, and so, despite the fact that she would've rather done paperwork all night, she'd gone.
Tonks didn't arrive as herself, of course - no point in being a Metamorphmagus if she didn't get to use her talents every once in a while. Acting as just another guest, she mingled with others, making a point of lingering near some of the highest-risk entrances and exits. If there was going to be an attack, any Dark wizard worth their salt would block those off immediately. Higher casualty rate that way.
Sipping a glass of sparkling juice charmed to look and smell like champagne, she eyed a particularly suspicious-looking wizard lurking near the door, his eyes scanning the crowd. She was on the verge of walking up to him - for an innocuous conversation, of course - when a bubbly woman all but bounced up to him and embraced him. Tonks exhaled and turned back to the crowd. This was going to be a hell of a long evening.