How many great works of film have never actually made it out of a writer's imagination and onto the page? As anyone who's ever attempted to put pen to paper can attest, the act of writing a screenplay sometimes feels just short of heroic. The Tacoma Film Festival understands this: Producer Tim Wurtz ("Brats") will lead you through the screenwriting process today, 6-9 p.m., at the Grand Cinema. Harrah! â€" Suzy Stump