Those attending Katy Perry’s upcoming “Witness Tour” ought to make sure they come early. Today, the pop singer has announced the impressive lineup of opening acts: Carly Rae Jepsen, Purity Ring, and Noah Cyrus. The latter two will handle the fall leg of the North American jaunt, while Jepsen appears on Perry’s early 2018 dates.

Additionally, due to production delays, the tour’s official kickoff has been pushed back from September 7th to September 19th. As a result, a handful of dates have been rescheduled.

Consult the updated itinerary below. Perry’s Witness album is out now.

Katy Perry 2017-18 Tour Dates:
09/19 – Montreal, QC @ Bell Centre $
09/21 – Uncasville, CT @ Mohegan Sun Arena $
09/22 – Pittsburgh, PA @ PPG Paints Arena $
09/24 – Columbus, OH @ Schottenstein Center $
09/25 – Washington, DC @ Verizon Center $
09/29 – Boston, MA @ TD Garden $
09/30 – Boston, MA @ TD Garden $
10/02 – New York, NY @ Madison Square Garden $
10/06 – New York, NY @ Madison Square Garden $
10/08 – Newark, NJ @ Prudential Center $
10/09 – Quebec, QC @ Videotron Centre $
10/11 – Brooklyn, NY @ Barclays Center $
10/12 – Philadelphia, PA @ Wells Fargo Center $
10/16 – Louisville, KY @ KFC Yum! Center $
10/18 – Nashville, TN @ Bridgestone Arena $
10/22 – St. Louis, MO @ Scottrade Center $
10/24 – Chicago, IL @ United Center $
10/25 – Chicago, IL @ United Center $
10/27 – Kansas City, MO @ Sprint Center $
10/31 – Toronto, ON @ Air Canada Centre $
11/01 – Toronto, ON @ Air Canada Centre $
11/07 – Los Angeles, CA @ Staples Center #
11/08 – Los Angeles, CA @ Staples Center #
11/10 – Los Angeles, CA @ Staples Center #
11/14 – San Jose, CA @ SAP Center #
11/24 – Salt Lake City, UT @ Vivint Smart Home Arena #
11/26 – Denver, CO @ Pepsi Center #
11/28 – Omaha, NE @ CenturyLink Center #
11/29 – Tulsa, OK @ BOK Center #
12/01 – St. Paul, MN @ Xcel Energy Center #
12/02 – Des Moines, IA @ Wells Fargo Arena #
12/04 – Milwaukee, WI @ BMO Harris Bradley Center #
12/06 – Detroit, MI @ Little Caesars Arena #
12/07 – Grand Rapids, MI @ Van Andel Arena #
12/09 – Indianapolis, IN @ Bankers Life Fieldhouse #
12/10 – Cleveland, OH @ Quicken Loans Arena #
12/12 – Atlanta, GA @ Philips Arena #
12/15 – Tampa, FL @ Amalie Arena #
12/17 – Orlando, FL @ Amway Center #
12/20 – Miami, FL @ American Airlines Arena #
01/05 – New Orleans, LA @ Smoothie King Center %
01/07 – Houston, TX @ Toyota Center %
01/10 – San Antonio, TX @ AT&T Center %
01/12 – Little Rock, AR @ Verizon Arena %
01/14 – Dallas, TX @ American Airlines Center %
01/19 – Phoenix, AZ @ Gila River Arena %
01/20 – Las Vegas, NV @ T-Mobile Arena %
01/31 – Sacramento, CA @ Golden1 Center %
02/02 – Portland, OR @ Moda Center at Rose Quarter %
02/03 – Tacoma, WA @ Tacoma Dome %
02/05 – Vancouver, BC @ Pepsi Live at Rogers Arena %
05/23 – Cologne, DE @ Lanxess Arena
05/24 – Antwerp, BE @ Sportpaleis Antwerp
05/26 – Amsterdam, NE @ Ziggo Dome
05/29 – Paris, FR @ Accorhotels Arena
06/01 – Zurich, CH @ Hallenstadion
06/02 – Bologna, IT @ Unipol Arena
06/04 – Vienna, AT @ Wiener Stadthalle
06/06 – Berlin, DE @ Mercedes-Benz Arena
06/08 – Copenhagen, DK @ Royal Arena
06/10 – Stockholm, SE @ Ericsson Globe
06/14 – London, UK @ The O2
06/18 – Birmingham, UK @ Barclaycard Arena
06/19 – Sheffield, UK @ Sheffield Arena
06/21 – Liverpool, UK @ Echo Arena
06/22 – Manchester, UK @ Manchester Arena
06/24 – Glasgow, UK @ The SSE Hydro
06/25 – Newcastle, UK @ Metro Radio Arena

$ = w/ Noah Cyrus
# = w/ Purity Ring
% = w/ Carly Rae Jepsen

Revisit the lyric video for her Nicki Minaj collaboration “Swish Swish”: