La Nuit aux Invalides
Next week, C & I have tickets to check out "La Nuit aux Invalides". It's the second year the 3D sound and light show has been produced in (and literally on) the inner courtyard of les Invalides. They have a website here in English, and tickets are 12€ for the show or 20€ for the show plus a guided visit of the Dome afterwards.
Keep it in mind if you're looking for something fun to do with all of the bank holidays coming up!