Being together for a few years, Fleur tries to get Harry to celebrate Christmas with her family, but he's nervous and tries to get out of it? Ron and Hermione convince him to go, saying she makes him happy, and Gabrielle plots to get her sister and boyfriend into comedic and romantic situations, but fails horribly. Harry feels out of his element not only in France, but at Fleur's childhood home surrounded by her friends and family.
Either magical or non-magical au, do whatever you want. I've been planning my own version of this the past few weeks but haven't sat down to write it yet.