I suppose getting Maid Cafes to promote their shops in a convention is common practice in Japan. But I still wish they had flyers or IDs with them so that we would know where to go too!
Then again, maybe she really is cosplaying from a series that I’m not familiar with. Please do leave a comment and let me know! Thanks to William for the photo!
EDIT: Thanks to everyone who commented saying she's Ayuzawa Misaki from Kaicho wa Maid-sama!