You thought, "I'm not dressing up. Halloween 2020 is basically cancelled." Then you started getting invited to some backyard hangouts and you're scrambling for a costume.
I gotchu. I did the Youtube search so you don't have to. Here's my curated choices of videos that feature last-minute costumes made from (mostly) things you can DIY with stuff in your closet.
Let the creativity run free for your version of a Bratz doll, Holly Golighty, Willy Wonka, Vanellope from Wreck it Ralph, any early 2000s girl or a vintage Minnie Mouse.