It's official.  Tickets go on sale Friday for the Saturday May 5th performance of Bill Cosby at Peoria Civic Center Theatre.  Cosby was last in Peoria as the featured speaker at the Martin Luther King Luncheon in January of 2009.  The comedian also gave the commencement address for Bradley University in May of 2003.   His last on stage performance here was in 2001, when he performed at Robertson Memeorial Fieldhouse.  Cosby's perfomance in May is a one show only performance.  Tickets will run from $45 to $75 dollars.