The artist and peace campaigner will light the Imagine Peace Tower illuminated memorial, located on the island of Vioey near Icelandic capital Reykjavik (RAY'-kyuh-vik), on Oct. 9.
A special performance by the Yoko Ono Plastic Ono Band will follow the ceremony.
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Lennon's widow is also expected to present awards from the Lennon Ono Grant for Peace, created to honor the former Beatle's peace activism.
Lennon was fatally shot outside the couple's Manhattan apartment building on Dec. 8, 1980.