Conservative activist Charlie Kirk is set to be honored Sunday at a massive public memorial service that will include speeches from PresidentDonald Trumpand Vice President JD Vance at State Farm Stadium in Glendale, Arizona.The memorial service for Kirk, who was assassinated on Sept. 10 during the first stop of Turning Point USAs "The American Comeback Tour" at Utah Valley University, is expected to draw tens of thousands of visitors, including senior White House officials and young conservatives influenced by the late 31-year-old.Trump said he would attend Sundays memorial in Arizona to honor Kirk, though he admitted "there are no words to really describe what happened.""He had just an army of young people," Trump said, describing Kirks influence on young conservatives. "They loved him so much. I mean, theyre devastated right now. Everybody is devastated."LIVE UPDATES: CHARLIE KIRK'S MEMORIAL SERVICE TAKING PLACE TODAY AT STATE FARM STADIUM IN GLENDALE, ARIZONATurning Point USA, the organization Kirk founded in 2012, released guidelines Saturday night for those attendingthe service, including a patriotic dress code and a strict no-bag policy.The memorial, titled, "Building a Legacy: Remembering Charlie Kirk," will begin at 11a.m. local time (2p.m. ET) and is "first come, first served based on stadium capacity," according to the event website.State Farm Stadium, home to the NFLs Arizona Cardinals, has fixed seating for 63,400 and can expand to over 73,000 for larger events, according to the venue.CHARLIE KIRK'S MEMORIAL: WHAT TO KNOW ABOUT THE EVENT IN ARIZONAOther scheduled speakers include Health and Human Services Secretary Robert F. Kennedy Jr., Secretary of War Pete Hegseth, Director of National Intelligence Tulsi Gabbard, Donald Trump Jr., Tucker Carlson, White House advisor Stephen Miller and Sergio Gor.Kirks widow and Turning Points new CEO, Erika Kirk, is also set to speak.The memorial will be broadcast on Fox News Channel and streamed on Fox News Digital.Fox News Digitals Greg Norman and Elizabeth Pritchett contributed to this report.