Yes! The pesto can easily be made the day before. For the dough, I recommend making it the day or night before, storing it in an airtight container and letting it rise in the fridge overnight. The next day, when the dough is warm enough to handle, you can assemble the wreath. I don't recommend braiding the wreath and storing it in the fridge overnight. The dough can crack when it's chilled and it's hard to predict how much it'll grow overnight.