There is no time like the present to figure out how to have a celebratory meal that is still low carb. Think of a different type of food indulgence that would still be special for your anniversary. A nice steak house or seafood place that you normally wouldn't go to. Some frozen yogurt places have sugar free flavors, so you could stop by there after or go home for a homemade low carb treat.

If your wife loves sushi, then go for the sashimi or a salmon skin salad. Or find a place that does poke bowls, they usually have alternatives to rice to put everything on top of.