The conservative student organization, which Kirk was involved in founding, describes him as an "American legend". At the memorial service, Kirk's "extraordinary life and lasting legacy" will be highlighted.
The ceremony will be held at State Farm Stadium in Glendale in Kirk's home state of Arizona. Both President Donald Trump and Vice President JD Vance and Foreign Minister Marco Rubio are expected to attend, according to media reports.
Right-wing debater and influencer Kirk had millions of followers on social media and is believed to have played a crucial role in getting so many young people to vote for Trump in last year's presidential election.
Kirk was shot to death on Wednesday during an appearance that Turning Point USA had arranged at a university in Utah
