If it’s a rainy day, I’d rather shop where it’s warm and dry and there’s a good variety of shops. This place has them all. It’s 3 levels of shopping, with different entrances and the underground parking of Groenplaats. What could improve is definitely the restaurant on one of the floors: it’s not the best looking place of Antwerp, on the contrary, even though most days is full at lunch time.
There’s a lot of coming and going in terms of shops. A few that are there already since some years are: Mango, Olleke Bolleke, Yves Rocher, Hema, Holland & Barrett, Bart Smit, Fnac. Checkout the events on their websites, they have some each season: https://www.grandbazarantwerp.be/events