FOOD: First things first. Before you go rushing off into your weekend, you should eat. Eastlake Italian restaurant Serafina is having a grand reopening Friday night after a kitchen remodel and bar facelift, with a new spring menu. It's their 18th anniversary, too. What more do you need? Friday, 5:30-11 p.m. // Serafina, 2043 Eastlake Avenue East // Entrees $16-$27 MUSIC: The GRAMMY-winning Shelby Lynne is at the Showbox SoDo Friday night. Her new......