Spierer, an Indiana University student, vanished June 3, 2011, after a night of partying with friends. The apparel merchandising major and Edgemont High School alumnus, who was 20 when she disappeared, would have been scheduled to graduate from college next month.
About 60 people have registered for the Sunday gathering, which will begin at the Monroe County Courthouse, the Indianapolis Star reported. Organizer Shelly Leonard said attendees will spend the afternoon hanging posters of Spierer around campus.
Hundreds of volunteers joined searches around Bloomington and parts of the surrounding wooded countryside searching unsuccessfully for Spierer after her disappearance.
Spierer's parents, Robert and Charlene, maintain a website -- www.findlauren.com -- with information on their missing daughter. In January, Lauren Spierer's family members marked her 22nd birthday with a message on their website that reiterated their desire for closure.
No remains have been found, and police have not made any arrests.
Spierer's parents have said they assume their daughter is dead.
With The Associated Press