(NewsNation) — A memorial for assassinated conservative activist Charlie Kirk will be held on Sept. 21, a person familiar with the details told NewsNation.

Turning Point USA, Kirk's conservative organization, will hold the memorial at State Farm Stadium outside Phoenix, where the Arizona Cardinals play.

Doors will open at 8 a.m. with the program set to begin at 11 a.m. local time, according to Turning Point USA. The organization is inviting those hoping to attend to register ahead of time, calling the memorial a "first come, first serve" event. Admission is free, according to the registration form, with additional details provided on Saturday, Sept. 20.

Kirk's casket arrived Thursday in his home state aboard Air Force Two, accompanied by Vice President JD Vance. Funeral details have not

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