Charli XCX & Troye Sivan start  U.S. tour in September.

Tour named "Sweat" begins in Detroit on Sept. 14.

Stops in Toronto, NYC, Boston, Chicago, Miami, Dallas, and more.

Special guest Shygirl joins  them on stage. .

Tour celebrates diversity in  music industry.

Fans can sign up for presale  until April 25. 

Charli's album "Brat" out  June 7, tour starts June 1. 

Sivan's European tour  starts in May. 

Charli's new album will be aggressive and personal. 

Presale starts April 25,  general sale April 26. 

Alaska Airlines Grounding Fixed: Flights Resume After Brief Delay