You can! I always make dips in advance when I'm entertaining, to save time and washing up on the day. This one will keep really well for 5 days in the fridge - take it out of the fridge about 30 minutes before you want to serve it so it's not fridge cold. The vibrant green colour will fade a little over time, to preserve it further, press a piece of cling film directly on top of the dip in the container you're storing it in, then pop the lid on. This will help to protect it from the air. Air = oxidization = fading green colour.