Multitasking is this Halloween weekend's mantra. The convenience of a Saturday night Oct. 30 party (which assumedly turns into Halloween) and efforts by other purists to throw a bash on Sunday evening has us all scrambling for multiple costumes in order to not be caught in the same outfit twice.

Take a breath and realize that you can don the same duds both nights and simply adopt different titles. Reference this list of last minute costumes that takes döppelgangers to a delightfully scary extreme:

Mary-Kate Olsen OR the Virgin of Guadalupe

Go for hooded bathrobes and ornate kimonos to master this waif-deity look. If you have the resources, take a GeMagic to a gauzy, old Snuggie, and you're set. In the event that you find mocking religious vestiges potentially offensive, then go as Mary-Kate on Saturday, and on Sunday eat one cracker and then say you're Ashley Olsen.

Adam Lambert OR Christopher Columbus

Since both Adam Lambert and Christopher Columbus came out of the closet this year, this costume couldn't be more timely. Sure, you'll have to switch up the accessories, but the pursuit of shiny things will carry over from one day to the next.

Brett Favre's Flaccid Penis OR Brett Favre's Erect Penis

Size may not matter, but original Halloween costumes definitely do. Take a page from Page Six and dress as Brett Favre's ambiguously aroused member. There's a chance it will be cold outside, but leave your hoodie at home if you don't want to be caught looking like an uncircumcised little prick.

Washington Ave. Bro' OR Australian Refugee

The assumed uniform of Washedupington Corridor bar hoppers, Ed Hardy clothing, has been banned in Stonnington, Australia, resulting in a mass expunging of glittery skull T-shirt devotees from the continent nation. Bonus: both personalities like riding Waves.

Cat Cora OR Cat Cora's partner

There's nothing wrong with a little self-love, and when you're a celebrity chef, it's understandable to want to spend your life with a mirror image of yourself. Experience the magic of these duplicate dames for yourself on Halloween, but don't be surprised if you also get confused with Chelsea Handler.

Rick Perry OR Gaston from Beauty and the Beast

Just released from the Disney vault: chiseled features and a receding dark hairline. Deck yourself out as one of these strapping lads and you'll spend Halloween weekend resisting offers from aspiring governor's mansion butlers and the Belles of the costume ball (or children's cartoon enthusiasts). Either way, you're in for a good time.

Slutty Big Bird OR Flapper Tranny

Dressing up as a promiscuous muppet is very "now," so capitalize on this trend before it goes the way of the Slanket and infinity scarf. When you're covered in yellow feathers, pink stripper heals and a frilly mini, you're sure to be the mother hen of the party. The next day, dazzle some dudes with this embodiment of 1920s flash. Best of all, this classy 'stume is available at Walmart.

Snooki's Poof OR a Rat

Emancipating a reality star's signature appendage was the "it" Halloween trend in New York and Paris in 2009, but we're just now starting to see it take root in Houston. And what better way to embrace it than to go as Jersey Shore diva Snooki's distinctive hair?

When you rebrand yourself as a subway rodent on Sunday, you can continue conversations about Fashion Week and speak in a trashy New York accent. See, this isn't that hard to pull off. If you need more inspiration, look to Banksy or the poof's Facebook fanpage and Twitter personality, @SnookisPoof.

Editor's note: Want to party with CultureMap on Halloween? We're teaming up with 13 Celsius for a Halloween bash Sunday from 4 p.m. to midnight. There's no cover charge, but food and drinks will be available for purchase. Wear your best double-purpose costume and see if we can guess your alter ego.