Tickets go on sale Saturday at 9 a.m. for a concert by The Artist (formerly known as Prince) Sept. 27 at 7 p.m. at The Gorge. There will be a limit of four tickets per ticketbuyer for the Purple Section and reserved seating. Purple Section tickets will be available only by phone, (206) 628-0888, or at Wherehouse Records in Lynnwood, Bellevue, on Capitol Hill in Seattle and in Tacoma. The random number distribution system will be used at all Ticketmaster outlets. Ticket prices are not yet available.