You can absolutely make your deviled eggs ahead of time, and I highly recommend it so you have less to do the day of your gathering. Boil your eggs up to 5-7 days in advance. Peel and cut your eggs, then prep your mixture, but wait to pipe the filling until right before you’re ready to enjoy. Store the egg whites in an airtight container and the filling in your piping bag in the fridge up to 2 days in advance. Then, all you have to do is fill your eggs when you’re ready! You can also fully assemble your deviled eggs a couple of hours in advance, cover with plastic wrap or store in an airtight container in the fridge, and pull them out when you are ready.