CHARITABLE INDULGENCES: If you're not too hungover from tonight's couture cocktails with Jack Mackenroth at Product Runway, something beautiful involving imported beer and fine Scotch is happening in Fremont both tonight and tomorrow: the HopScotch Spring Beer and Scotch Festival. The festival's a benefit for NW Folklife, so think of your purchase of extra tequila tastings as an act of springtime charity. 5 p.m.-12 a.m. Friday, 1 p.m.-12 a.m. Saturday // Fremont Studios, 155 N.......