The organizers of the U.K.'s Sonisphere festival will honor late SLIPKNOT bassist Paul Gray on July 10 when the band closes the festival with a headlining performance on the Apollo Arena stage. At 2:00 p.m. on that day, a two-minute silence will fall over the whole arena and all the stages at Knebworth, allowing fans to pay tribute to Gray, who died last year. Fans will also be able to leave a more personal tribute in the book of remembrance that will be left at the Metal Hammer signing tent for the duration of the weekend. The giant, leather-bound book will be open to those who wish to leave their own obituaries, thoughts or drawings, from midday to midnight each day. The book will be passed to SLIPKNOT at the end of the festival on Sunday night.Gray passed away in May 2010 from an accidental overdose of drugs, leaving behind his wife Brenna and daughter October, who was born the following August. Playing bass for SLIPKNOT on the current run of tour dates is Donnie Steele, who was the guitarist in an early incarnation of the group. Steele, however, is hidden from the audience's view. SLIPKNOT singer Corey Taylor has expressed doubts about making another SLIPKNOT record without Gray, although other band members have indicated that they intend to record again.