As you've probably figured out, I love dying my hair strange colors (it's teal right now). But the dye I use takes weeks to wash out of blonde hair. If you want to get your hair festival-ready without a ton of commitment (or chemicals!), try Tinge! It's pastel conditioner that's easy to use and comes out in 3-5 washes! Tinge comes in five different colors: purple, silver, pink, turquoise, and peach. It's recommended only for pre-lightened hair, so if you're already rocking blonde, you're good to go! (And my favorite part? Tinge is animal cruelty free!)
(Thanks for the recommendation, Miran!)