Katy Perry's Las Vegas Strip residency concludes this week. 

If you have tickets to Katy Perry's "Play" residency play at Resorts World Theatre, you better get ready to dress up for Halloween.  

Attendees are encouraged to dress as their favorite Perry character for a special holiday party on Tuesday. 

They can even recreate an outfit from one of her eye-catching concert tours or music videos to enter in the "Best Katy" costume contest.

To enter the contest and have their picture taken, participants must show up at the theater dressed in costume starting at 4 p.m. on Halloween. 

The contest runs until 6 p.m. The three winners will be contacted and declared before the 8 p.m. show. 

each earning a chance to meet Perry following the performance. Additionally, every attendee at the Resorts World performance ,

that evening will be given a temporary red mushroom tattoo created by Los Angeles artist Liz Kim, 

who just visited Las Vegas to tattoo the cast and crew of "Play." Axs.com is where you may purchase any leftover tickets for the Halloween concert.

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