The Who are celebrating their 50th anniversary. And they want your help.The great rockers who will begin what looks like their final tour November 3rd, are seeking rare memorabilia from fans for their 50th anniversary.The British rockers, who are planning a yearlong series of special releases and events, including a Greatest Hits collection and UK Arena tour, to mark the occasion later this year, are eager to include lost recordings and footage in their celebrations, and have asked fans and collectors around the world to trawl through their archives for unusual radio and TV performances, home movies from gigs, extraordinary bootleg material, demos, photographs and merchandise. This final tour could be a good by. Front man Roger Daltrey said ''We can't go on touring forever, we don't know how long we will go on touring, it's an open-ended thing at the moment but there will be a finality to it.''